Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media SA  

Rice is the most important crop species in the world, being staple food of more than 80% of people in Asia. About 80% of rice grain is composed of carbohydrates (starch), with its protein content as low as 7–8%. Therefore, increasing the protein content of rice offers way to create a stable protein source that contributes to improving malnutrition and health problems worldwide. We detected two rice lines harboring a significantly higher protein content (namely, HP5-7 and HP7-5) in the EG4 population. The EG4 strain of rice is a unique material in that the transposon mPing has high transpositional activity and high copy numbers under natural conditions. Other research indicated that mPing is abundant in the gene-rich euchromatic regions, suggesting that mPing amplification should create new allelic variants, novel regulatory networks, and phenotypic changes in the EG4 population. Here, we aimed to identify the candidate genes and/or mPing insertion sites causing high protein content by comprehensively identifying the mPing insertion sites and carrying out an RNA-seq-based transcriptome analysis. By utilizing the next-generation sequencing (NGS)-based methods, ca. 570 mPing insertion sites were identified per line in the EG4 population. Our results also indicated that mPing apparently has a preference for inserting itself in the region near a gene, with 38 genes in total found to contain the mPing insertion in the HP lines, of which 21 and 17 genes were specific to HP5-7 and HP7-5, respectively. Transcriptome analysis revealed that most of the genes related to protein synthesis (encoding glutelin, prolamin, and globulin) were up-regulated in HP lines relative to the control line. Interestingly, the differentially expressed gene (DEG) analysis revealed that the expression levels of many genes related to photosynthesis decreased in both HP lines; this suggests the amount of starch may have decreased, indirectly contributing to the increased protein content. The high-protein lines studied here are expected to contribute to the development of high protein-content rice by introducing valuable phenotypic traits such as high and stable yield, disease resistance, and abundant nutrients.

DOI： 10.3389/fpls.2022.969582

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media SA  

Transposable elements (TEs) constitute ~80% of the complex bread wheat genome and contribute significantly to wheat evolution and environmental adaptation. We studied 52 TE insertion polymorphism markers to ascertain their efficiency as a robust DNA marker system for genetic studies in wheat and related species. Significant variation was found in miniature inverted-repeat transposable element (MITE) insertions in relation to ploidy with the highest number of “full site” insertions occurring in the hexaploids (32.6 ± 3.8), while the tetraploid and diploid progenitors had 22.3 ± 0.6 and 15.0 ± 3.5 “full sites,” respectively, which suggested a recent rapid activation of these transposons after the formation of wheat. Constructed phylogenetic trees were consistent with the evolutionary history of these species which clustered mainly according to ploidy and genome types (SS, AA, DD, AABB, and AABBDD). The synthetic hexaploids sub-clustered near the tetraploid species from which they were re-synthesized. Preliminary genotyping in 104 recombinant inbred lines (RILs) showed predominantly 1:1 segregation for simplex markers, with four of these markers already integrated into our current DArT-and SNP-based linkage map. The MITE insertions also showed stability with no single excision observed. The MITE insertion site polymorphisms uncovered in this study are very promising as high-potential evolutionary markers for genomic studies in wheat.

DOI： 10.3389/fpls.2022.995586

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Authorship：Last author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media SA  

The southern root-knot nematode (SRKN; Meloidogyne incognita) is a typical parasitic nematode that affects sweetpotato [Ipomoea batatas (L.) Lam.], causing a significant decrease in crop yield and commercial value. In Japan, the SRKN is classified into 10 races: SP1–SP5, SP6-1, SP6-2, and SP7–SP9, with the dominant race differing according to the cultivation area. Soil insecticides have previously been used to reduce the soil density of SRKNs; however, this practice is both costly and labor intensive. Therefore, the development of SRKN-resistant sweetpotato lines and cultivars is necessary. However, due to the complexity of polyploid inheritance and the highly heterogeneous genomic composition of sweetpotato, genetic information and research for this species are significantly lacking compared to those for other major diploid crop species. In this study, we utilized the recently developed genome-wide association approach, which uses multiple-dose markers to assess autopolyploid species. We performed an association analysis to investigate resistance toward SRKN-SP2, which is the major race in areas with high sweetpotato production in Japan. The segregation ratio of resistant and susceptible lines in the F₁ mapping population derived from the resistant “J-Red” and susceptible “Choshu” cultivars was fitted to 1: 3, suggesting that resistance to SP2 may be regulated by two loci present in the simplex. By aligning the double digest restriction-site associated DNA sequencing reads to the published Ipomoea trifida reference sequence, 46,982 single nucleotide polymorphisms (SNPs) were identified (sequencing depth > 200). The association study yielded its highest peak on chromosome 7 (Chr07) and second highest peak on chromosome 3 (Chr03), presenting as a single-dose in both loci. Selective DNA markers were developed to screen for resistant plants using the SNPs identified on Chr03 and Chr07. Our results showed that SRKN-SP2-resistant plants were selected with a probability of approximately 70% when combining the two selective DNA markers. This study serves as a model for the identification of genomic regions that control agricultural traits and the elucidation of their effects, and is expected to greatly advance marker-assisted breeding and association studies in polyploid crop species.

DOI： 10.3389/fpls.2022.858747

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Authorship：Last author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Because weevils are the most damaging pests of sweetpotato, the development of cultivars resistant to weevil species is considered the most important aspect in sweetpotato breeding. However, the genes and the underlying molecular mechanisms related to weevil resistance are yet to be elucidated. In this study, we performed an RNA sequencing-based transcriptome analysis using the resistant Kyushu No. 166 (K166) and susceptible Tamayutaka cultivars. The weevil resistance test showed a significant difference between the two cultivars at 30 days after the inoculation, specifically in the weevil growth stage and the suppressed weevil pupation that was only observed in K166. Differential expression and gene ontology analyses revealed that the genes upregulated after inoculation in K166 were related to phosphorylation, metabolic, and cellular processes. Because the weevil resistance was considered to be related to the suppression of larval pupation, we investigated the juvenile hormone (JH)-related genes involved in the inhibition of insect metamorphosis. We found that the expression of some terpenoid-related genes, which are classified as plant-derived JHs, was significantly increased in K166. This is the first study involving a comprehensive gene expression analysis that provides new insights about the genes and mechanisms associated with weevil resistance in sweetpotato.

DOI： 10.3390/plants10081535

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DOI： 10.1007/s10126-020-09999-8

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

<title>Abstract</title>
Next-generation sequencing (NGS)-based genotyping methods can generate numerous genetic markers in a single experiment and have contributed to plant genetic mapping. However, for high precision genetic analysis, the complicated genetic segregation mode in polyploid organisms requires high-coverage NGS data and elaborate analytical algorithms. In the present study, we propose a simple strategy for the genetic mapping of polyploids using low-coverage NGS data. The validity of the strategy was investigated using simulated data. Previous studies indicated that accurate allele dosage estimation from low-coverage NGS data (read depth &amp;lt; 40) is difficult. Therefore, we used allele dosage probabilities calculated from read counts in association analyses to detect loci associated with phenotypic variations. The allele dosage probabilities showed significant detection power, although higher allele dosage estimation accuracy resulted in higher detection power. On the contrary, differences in the segregation patterns between the marker and causal genes resulted in a drastic decrease in detection power even if the marker and casual genes were in complete linkage and the allele dosage estimation was accurate. These results indicated that the use of a larger number of markers is advantageous, even if the accuracy of allele dosage estimation is low. Finally, we applied the strategy for the genetic mapping of autohexaploid sweet potato (Ipomoea batatas) populations to detect loci associated with agronomic traits. Our strategy could constitute a cost-effective approach for preliminary experiments done performed to large-scale studies.

DOI： 10.1534/g3.120.401433

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Silica cell walls of diatoms have attracted attention as a source of nanostructured functional materials and have immense potential for a variety of applications. Previous studies of silica cell wall formation have identified numerous involved proteins, but most of these proteins are species-specific and are not conserved among diatoms. However, because the basic process of diatom cell wall formation is common to all diatom species, ubiquitous proteins and molecules will reveal the mechanisms of cell wall formation. In this study, we assembled de novo transcriptomes of three diatom species, Nitzschia palea, Achnanthes kuwaitensis, and Pseudoleyanella lunata, and compared protein-coding genes of five genome-sequenced diatom species. These analyses revealed a number of diatom-specific genes that encode putative endoplasmic reticulum-targeting proteins. Significant numbers of these proteins showed homology to silicanin-1, which is a conserved diatom protein that reportedly contributes to cell wall formation. These proteins also included a previously unrecognized SET domain protein methyltransferase family that may regulate functions of cell wall formation-related proteins and long-chain polyamines. Proteomic analysis of cell wall-associated proteins in N. palea identified a protein that is also encoded by one of the diatom-specific genes. Expression analysis showed that candidate genes were upregulated in response to silicon, suggesting that these genes play roles in silica cell wall formation. These candidate genes can facilitate further investigations of silica cell wall formation in diatoms.

DOI： 10.1007/s10126-020-09976-1

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© Springer Science+Business Media, LLC, part of Springer Nature 2020. Transposable element (TE) marker system was developed considering the useful properties of the transposable elements such as their large number in the animal and plant genomes, high rate of insertion polymorphism, and ease of detection. Various methods have been employed for developing a large number of TE markers in several crop plants for genomics studies. Here we describe some of these methods including the recent whole genome search. We also review the application of TE markers in molecular breeding.

DOI： 10.1007/978-1-0716-0235-5_11

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Breeding  

<p>While sweetpotato (Ipomoea batatas L.) improvement has generally been done by field-based selection, molecular genetic studies on traits of interest, i.e., molecular markers are needed for enhancing the breeding program of this world's 7^th most important crop, as such markers facilitate marker-assisted selection. Here, we performed a combined approach of QTLs analyses and GWAS of storage root β-carotene content (BC), dry-matter (DM) and starch content (SC) using the genetic linkage maps constructed with 5,952 and 5,640 SNPs obtained from F₁ progenies between cultivars 'J-Red' and 'Choshu'. BC was negatively correlated with DM (r = –0.45) and SC (r = –0.51), while DM was positively correlated with SC (r = 0.94). In both parental maps, a total of five, two and five QTL regions on linkage groups 7 and 8 were associated with BC, DM and SC, respectively. In GWAS of BC, one strong signal (P = 1.04 × 10^–9) was observed on linkage group 8, which co-located with one of the above QTL regions. The SNPs markers found here, particularly for β-carotene, would be useful base resources for future marker-assisted selection program with this trait.</p>

DOI： 10.1270/jsbbs.19099

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DOI： 10.1270/jsbbs.19116

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KEY MESSAGE: We apply the GWAS to sweet potato genome, and identified the SNPs associated with yield and weevil resistance. The sweet potato (Ipomoea batatas (L.) Lam) is a highly heterozygous, outcrossing, polyploid species, which presents challenges for genetic analysis. Therefore, we considered that genome-wide association studies (GWAS) may be applied to the study of the sweet potato genome. The yield of two sweet potato varieties [Purple Sweet Lord (PSL) and 90IDN-47] was assessed at two locations (Kumamoto and Okinawa prefectures) in Japan in 2013 and the yield scores were used for GWAS. The results showed that there were several single nucleotide polymorphisms (SNP) above the significance thresholds in PSL; two peaks were detected in Kumamoto and Okinawa on the Ib03-3 and Ib01-4 linkage groups of PSL, respectively. As for 90IDN-47, one relatively high peak was detected in Kumamoto on the Ib13-8 linkage group. Interestingly, although high peaks above significance thresholds were detected in Kumamoto and Okinawa in PSL, the peaks were located in different linkage groups. This result suggests that the genetic regions controlling yield may change in response to environmental conditions. Additionally, we investigated the degree of weevil damage to the plants, which is the greatest problem in sweet potato cultivation in Okinawa. In this experiment, no SNPs were identified above the significance thresholds. However, one relatively high peak was found in the 90IDN-47 genotype, which showed resistance to weevils. On the other hand, one relatively high peak was also detected in the PSL genotype, which showed susceptibility to weevils. These results suggest that two regions could affect weevil resistance and may contain the gene(s) controlling weevil resistance.

DOI： 10.1007/s00299-019-02445-7

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Authorship：Last author,　Corresponding author   Language：English   Publisher：Oxford University Press ({OUP})  

The southern root-knot nematode, Meloidogyne incognita, is a pest that decreases yield and the quality of sweetpotato [Ipomoea batatas (L.) Lam.]. There is a demand to produce resistant cultivars and develop DNA markers to select this trait. However, sweetpotato is hexaploid, highly heterozygous, and has an enormous genome (∼3 Gb), which makes genetic linkage analysis difficult. In this study, a high-density linkage map was constructed based on retrotransposon insertion polymorphism, simple sequence repeat, and single nucleotide polymorphism markers. The markers were developed using F1 progeny between J-Red, which exhibits resistance to multiple races of M. incognita, and Choshu, which is susceptible to multiple races of such pest. Quantitative trait locus (QTL) analysis and a genome-wide association study detected highly effective QTLs for resistance against three races, namely, SP1, SP4, and SP6-1, in the Ib01-6 J-Red linkage group. A polymerase chain reaction marker that can identify genotypes based on single nucleotide polymorphisms located in this QTL region can discriminate resistance from susceptibility in the F1 progeny at a rate of 70%. Thus, this marker could be helpful in selecting sweetpotato cultivars that are resistant to multiple races of M. incognita.

DOI： 10.1093/dnares/dsz018

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Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

DOI： 10.1093/jxb/erx468

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Publishing type：Research paper (scientific journal)   Publisher：The Japanese Nematological Society  

DOI： 10.3725/jjn.47.29

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Authorship：Lead author,　Last author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Breeding  

DOI： 10.1270/jsbbs.16142

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Authorship：Lead author   Language：English   Publisher：JAPAN SOC HORTICULTURAL SCI  

Transposable elements (TEs) are mobile genetic elements in the eukaryotic genome. They are divided into two classes (class I: retrotransposons and class II: DNA transposons) based on their structure and manner of transposition. TEs are major components of the eukaryotic genome and retrotransposons are especially abundant in higher-plant genomes. As retrotransposon insertions with high copy numbers are dispersed throughout the genome and are inherited genetically, insertion polymorphisms among crop cultivars have been used as molecular markers. Recently, we developed an efficient method for screening the long terminal repeats (LTRs) of retrotransposon families that exhibit high levels of insertion polymorphisms among crop cultivars using a next-generation sequencing (NGS) platform. This method focuses on the primer binding site (PBS) that is adjacent to the 5' LTR and has a conserved DNA sequence among different LTR retrotransposon families. Construction of a sequencing library through PCR amplification using the PBS conserved sequence allowed us to acquire a large number of LTR sequences and their insertion sites throughout the genome. From our data analysis, we screened the LTR sequences that showed high levels of insertion polymorphism among closely related cultivars. In addition, we identified the insertion sites of these identified LTR retrotransposon families at the genome-wide scale in a number of cultivars with an NGS platform, which enabled us to reveal the genetic relationships among the cultivars and acquire a number of molecular markers for cultivar screening. Our results indicated that the target sequencing of these retrotransposon insertion sites was highly effective for DNA genotyping and marker development without requiring any whole-genome sequence information. This review describes the genomic structure and evolutionary aspects of TEs and discusses the development of molecular markers based on retrotransposon insertion polymorphisms.

DOI： 10.2503/hortj.MI-IR02

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPANESE SOC BREEDING  

Sweetpotato (Ipomoea batatas L.) is an outcrossing hexaploid species with a large number of chromosomes (2n = 6x = 90). Although sweetpotato is one of the world's most important crops, genetic analysis of the species has been hindered by its genetic complexity combined with the lack of a whole genome sequence. In the present study, we constructed a genetic linkage map based on retrotransposon insertion polymorphisms using a mapping population derived from a cross between 'Purple Sweet Lord' (PSL) and '90IDN-47' cultivars. High-throughput sequencing and subsequent data analyses identified many Rtsp-1 retrotransposon insertion sites, and their allele dosages (simplex, duplex, triplex, or double-simplex) were determined based on segregation ratios in the mapping population. Using a pseudo-testcross strategy, 43 and 47 linkage groups were generated for PSL and 90IDN-47, respectively. Interestingly, most of these insertions (similar to 90%) were present in a simplex manner, indicating their utility for linkage map construction in polyploid species. Additionally, our approach led to savings of time and labor for genotyping. Although the number of markers herein was insufficient for map-based cloning, our trial analysis exhibited the utility of retrotransposon-based markers for linkage map construction in sweetpotato.

DOI： 10.1270/jsbbs.65.145

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In many crop species, DNA fingerprinting is required for the precise identification of cultivars to protect the rights of breeders. Many families of retrotransposons have multiple copies throughout the eukaryotic genome and their integrated copies are inherited genetically. Thus, their insertion polymorphisms among cultivars are useful for DNA fingerprinting. In this study, we conducted a DNA fingerprinting based on the insertion polymorphisms of active retrotransposon families (Rtsp-1 and LIb) in sweet potato. Using 38 cultivars, we identified 2,024 insertion sites in the two families with an Illumina MiSeq sequencing platform. Of these insertion sites, 91.4% appeared to be polymorphic among the cultivars and 376 cultivar-specific insertion sites were identified, which were converted directly into cultivar-specific sequence-characterized amplified region (SCAR) markers. A phylogenetic tree was constructed using these insertion sites, which corresponded well with known pedigree information, thereby indicating their suitability for genetic diversity studies. Thus, the genome-wide comparative analysis of active retrotransposon insertion sites using the bench-top MiSeq sequencing platform is highly effective for DNA fingerprinting without any requirement for whole genome sequence information. This approach may facilitate the development of practical polymerase chain reaction-based cultivar diagnostic system and could also be applied to the determination of genetic relationships.

DOI： 10.1093/dnares/dsu015

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In many crops species, the development of a rapid and precise cultivar discrimination system has been required for plant breeding and patent protection of plant cultivars and agricultural products. Here, we successfully evaluated strawberry cultivars via a novel method, namely, the single tag hybridization (STH) chromatographic printed array strip (PAS) using the PCR products of eight genomic regions. In a previous study, we showed that genotyping of eight genomic regions derived from FaRE1 retrotransposon insertion site enabled to discriminate 32 strawberry cultivars precisely, however, this method required agarose/acrylamide gel electrophoresis, thus has the difficulty for practical application. In contrast, novel DNA detection method in this study has some great advantages over standard DNA detection methods, including agarose/acrylamide gel electrophoresis, because it produces signals for DNA detection with dramatically higher sensitivity in a shorter time without any preparation or staining of a gel. Moreover, this method enables the visualization of multiplex signals simultaneously in a single reaction using several independent amplification products. We expect that this novel method will become a rapid and convenient cultivar screening assay for practical purposes, and will be widely applied to various situations, including laboratory research, and on-site inspection of plant cultivars and agricultural products. (C) 2014 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.jbiotec.2014.06.013

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Retrotransposons are major components of higher plant genomes, and long terminal repeat (LTR) retrotransposons are especially predominant. Thus, numerous LTR retrotransposon families with high copy numbers exist in most plant genomes. As the integrated copies of these retrotransposons are genetically inherited, their insertion polymorphisms among crop cultivars have been used as functional molecular markers such as inter-retrotransposon amplification polymorphism (IRAP), retrotransposon microsatellite amplification polymorphism (REMAP), retrotransposon-based insertion polymorphism (RBIP) and sequence-specific amplification polymorphism (S-SAP). However, the effective use of these methods requires suitable LTR sequences showing high insertion polymorphism among crop cultivars. Recently, we conducted an efficient screening of LTR retrotransposon families that showed high insertion polymorphism among closely related strawberry cultivars using a next-generation sequencing platform. This method focuses on the primer binding site (PBS), which is adjacent to the 5' LTR sequence and is conserved among different LTR retrotransposon families. Construction of a sequencing library using the PBS motif allowed us to identify a large number of LTR sequences and their insertion sites throughout the genome. The LTR sequences identified by our method showed high insertion polymorphism among closely related strawberry cultivars, and these families should thus be useful in the development of molecular markers for phylogenetic and genetic diversity studies. This article briefly describes the general aspects of retrotransposon-based molecular markers and also outlines our method for screening LTR sequences suitable for genetic analyses.(. http://www.ddbj.nig.ac.jp/).

DOI： 10.1016/j.cpb.2014.09.001

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Language：English   Publisher：JAPANESE SOC BREEDING  

Though transposable elements (TEs) have been considered as an efficient source of evolution, it has never been possible to test this hypothesis because most of TE insertions had occurred millions of years ago, or because currently active TEs have very few copies in a host genome. However, mPing, the first active DNA transposon in rice, was revealed to hold a key to answer this question. mPing has attained high copy numbers and still retained very high activity in a traditional rice strain, which enabled direct observation of behavior and impact of a bursting TE. A comprehensive analysis of mPing insertion sites has revealed it avoids exons but prefers promoter regions and thus moderately affects transcription of neighboring genes. Some of the mPing insertions have introduced possibly useful expression profile to adjacent genes that indicated TE's potential in de novo formation of gene regulatory network.

DOI： 10.1270/jsbbs.64.109

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS  

Retrotransposons have been used frequently for the development of molecular markers by using their insertion polymorphisms among cultivars, because multiple copies of these elements are dispersed throughout the genome and inserted copies are inherited genetically. Although a large number of long terminal repeat (LTR) retrotransposon families exist in the higher eukaryotic genomes, the identification of families that show high insertion polymorphism has been challenging. Here, we performed an efficient screening of these retrotransposon families using an Illumina HiSeq2000 sequencing platform with comprehensive LTR library construction based on the primer binding site (PBS), which is located adjacent to the 5' LTR and has a motif that is universal and conserved among LTR retrotransposon families. The paired-end sequencing library of the fragments containing a large number of LTR sequences and their insertion sites was sequenced for seven strawberry (Fragaria x ananassa Duchesne) cultivars and one diploid wild species (Fragaria vesca L.). Among them, we screened 24 families with a "unique" insertion site that appeared only in one cultivar and not in any others, assuming that this type of insertion should have occurred quite recently. Finally, we confirmed experimentally the selected LTR families showed high insertion polymorphisms among closely related cultivars.

DOI： 10.1139/gen-2014-0031

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DOI： 10.1093/dnares/dsp004

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Publisher：Springer US  

DOI： 10.1007/978-1-0716-0235-5

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Other Link： http://link.springer.com/content/pdf/10.1007/978-1-0716-0235-5

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DOI： 10.1270/jsbbr.21.w02

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<p>The southern root-knot nematode (SRKN) includes at least nine races, SP1 to SP9, which were identified based on their different responses to five differential sweetpotato cultivars, ' Norin-1', ' Norin-2', 'Tanegashimamurasaki-7', 'Elegant Summer', and 'J-Red'. In this study, we propose a modified method for SRKN race identification in which the threshold of response is 10 egg masses instead of the two-egg-mass threshold used in the original method, when a sweetpotato plant was inoculated with 500 second-stage juveniles. According to this method, two isolates of SP6, Okiishi-12 and Ishigaki-2, showed the same response to each of these five cultivars. We found, however, that three sweetpotato cultivars, 'Murasakimasari', 'Suzukogane', and 'Chienoha', were resistant to the Okiishi-12 isolate and susceptible to the Ishigaki-2 isolate. These results indicated that the Okiishi-12 and Ishigaki-2 isolates were distinct and that SP6 included at least two races. We suggest that the Okiishi-12 and Ishigaki-2 isolates should be distinguished by sub-numbers and designated SP6-1 and SP6-2, respectively. Five isolates of SP6 collected from a sweetpotato field in Chiba prefecture were examined, and all of them were identified as SP6-1.</p>

DOI： 10.3725/jjn.47.29

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Other Link： https://agriknowledge.affrc.go.jp/RN/2010921264

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DOI： 10.1270/jsbbr.18.27

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供試したサツマイモ主要品種の中で「べにはるか」に特異的なRtsp-1挿入箇所INS1が得られ,「べにはるか」の品種判別用DNAマーカーの開発に有用と考えられた.ただし,親品種である「春こがね」でも増幅が認められたことから,「春こがね」との判別が必要な場合は,「春こがね」で増幅の見られない挿入箇所INS2の利用などの検討も必要である.

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DOI： 10.1270/jsbbr.17.88

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Language：English   Publisher：Institute of Radiation Breeding, Ministry of Agriculture & Forestry  

Mendelの遺伝法則の再発見(1900)を契機として、遺伝学に基礎を置く科学的育種が始まり、これによってイネやコムギを中心に作物の品種改良は急速な勢いで進展した。しかし、1990年代に入ると、この伸びは急に鈍化し、食の確保に対する不安がにわかに現実のものとなってきた。近年のイネ、コムギの多収化は、半矮性という草型を基本骨格とし、収穫指数を高めることによって実現した。しかし、収穫指数が上限に達したとみられる今日、従来の半矮性遺伝子を利用した育種を行う限り、これ以上の多収は望めないとみられている。このため、多収を実現する新規有用遺伝子の開発が世界的な重要課題となっており、これには突然変異の誘発が大きな役割を担うと考えられている。突然変異には、自然突然変異と誘発突然変異とがあるが、分子あるいは染色体レベルでそれらを特徴づけることはできない。人間は長い間、自然突然変異を利用して作物改良を行ってきた。これらの遺伝資源が利用尽くされつつある今、新たな有用遺伝子の開発を誘発突然変異に求めることは自然のなりゆきであろう。本報告では、まず、農業上有用な遺伝子の大半が地球上から消失することがあっても、放射線や化学変異原、さらにはゲノム中に存在する転移因子によってそれらとほぼ同じ機能(表現型)をもつ同類対立遺伝子を誘発できることを、台湾の稲作に著しい生産性の向上と安定とをもたらした、基本栄養成長相遺伝子座Ef1座の機能喪失型アレル1ef1と同類対立遺伝子の関係にある誘発突然変異アレルef1-h、およびわが国イネ品種の出穂期の変異に関わるHd17座の劣性アレルより機能喪失度の大きい同座の誘発突然変異アレルef7、さらに、緑の革命のイネ版に寄与した半矮性遺伝子d47(自然突然変異)の同類対立遺伝子d49(t)およびsd1を例にとって説明する。つぎに、突然変異原処理によって新たな有用遺伝子が誘発できることを、日長感応性を完全に消失させ、著しい早生化をもたらす遺伝子se13を例にとって、また、これまで有用性が認識されていなかった遺伝子のなかにも視点を変えれば有用遺伝子になる可能性のある遺伝子があることを、中国における固定型ジャポニカ品種の超多収化に貢献する直立穂遺伝子EPを例にとって説明する。また、転移因子のなかでも、その数の多さから遺伝子やゲノムの進化に大きく関わっていると考えられているMITE(miniature inverted-repeat transposable elements)のなかで現在、もっとも活発に転移を繰り返しているイネのmPingの発見の経緯とその遺伝学的特徴、さらにその育種上の利用について説明する。

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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Event date： 2021.7.30

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

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Event date： 2021.3.19 - 2021.3.21

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Venue：オンライン  

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Event date： 2021.3.19 - 2021.3.21

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Venue：オンライン  

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Event date： 2020.12.12

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Venue：オンライン  

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Event date： 2020.12.12

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Venue：オンライン  

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Event date： 2020.12.12

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Venue：オンライン  

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Event date： 2020.12.12

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Event date： 2020.11.27

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Venue：東京大学 弥生講堂  

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Event date： 2020.11.26 - 2020.11.27

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Venue：東京  

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Event date： 2020.11.26 - 2020.11.27

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Venue：東京  

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Event date： 2020.10.10 - 2020.10.11

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Venue：オンライン  

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Event date： 2020.10.10 - 2020.10.11

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Venue：オンライン  

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Event date： 2020.10.2

Presentation type：Oral presentation (general)  

Venue：オンライン  

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Event date： 2019.12.21 - 2019.12.22

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Venue：岡山大学  

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Venue：岡山大学  

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Venue：岡山大学  

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Venue：岡山大学  

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Venue：岡山大学  

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Event date： 2019.12.21 - 2019.12.22

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Venue：岡山大学  

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Venue：岡山大学  

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Event date： 2019.12.21 - 2019.12.22

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Venue：岡山大学  

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Event date： 2019.12.21 - 2019.12.22

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Venue：岡山大学  

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Event date： 2019.12.5 - 2019.12.6

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Venue：九州労働金庫宮崎支店労働福祉会館  

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Event date： 2019.12.5 - 2019.12.6

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Venue：九州労働金庫宮崎支店労働福祉会館  

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Event date： 2019.11.8

Presentation type：Symposium, workshop panel (nominated)  

Venue：岡山大学農学部  

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Event date： 2019.10.14 - 2019.10.16

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Venue：Shanghai Chenshan Plant Science Research Center, Shanghai, China  

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Event date： 2019.9.11 - 2019.9.13

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Venue：文部科学省研究交流センター  

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Event date： 2019.9.6 - 2019.9.7

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Venue：近畿大学（奈良キャンパス）  

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Event date： 2019.9.6 - 2019.9.7

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Venue：近畿大学（奈良キャンパス）  

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Event date： 2019.9.6 - 2019.9.7

Presentation type：Poster presentation  

Venue：近畿大学（奈良キャンパス）  

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Event date： 2019.9.6 - 2019.9.7

Presentation type：Poster presentation  

Venue：近畿大学（奈良キャンパス）  

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Event date： 2019.9.6 - 2019.9.7

Presentation type：Oral presentation (general)  

Venue：近畿大学（奈良キャンパス）  

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Event date： 2019.8.30

Presentation type：Symposium, workshop panel (nominated)  

Venue：INNOVATION CENTER BOARDROOM  

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Event date： 2019.8.28

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Venue：IPIC Main Seminar Room, JKUAT Main Campus  

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Event date： 2019.6.6 - 2019.6.8

Presentation type：Oral presentation (general)  

Venue：China  

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Event date： 2018.12.15 - 2018.12.16

Presentation type：Poster presentation  

Venue：鳥取大学  

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Event date： 2018.12.15 - 2018.12.16

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Venue：鳥取大学  

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Event date： 2018.12.15 - 2018.12.16

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Venue：鳥取大学  

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Venue：鳥取大学  

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Event date： 2018.12.15 - 2018.12.16

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Venue：鳥取大学  

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Event date： 2018.12.10

Presentation type：Oral presentation (invited, special)  

Venue：東京農業大学世田谷キャンパス  

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Event date： 2018.12.5 - 2018.12.7

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Venue：松江イングリッシュガーデン  

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Venue：パシフィコ横浜  

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Event date： 2018.9.22 - 2018.9.24

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Venue：岡山大学  

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Venue：明治大学  

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Event date： 2018.9.5 - 2018.9.8

Presentation type：Symposium, workshop panel (nominated)  

Venue：Jeonju city, Korea  

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Event date： 2018.9.5 - 2018.9.8

Presentation type：Poster presentation  

Venue：Jeonju city, Korea  

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Event date： 2018.9.5 - 2018.9.8

Presentation type：Poster presentation  

Venue：Jeonju city, Korea  

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Event date： 2018.9.5 - 2018.9.8

Presentation type：Poster presentation  

Venue：Jeonju city, Korea  

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Event date： 2018.8.26 - 2018.8.28

Presentation type：Symposium, workshop panel (nominated)  

Venue：金沢商工会議所会館  

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Event date： 2018.3.25 - 2018.3.26

Presentation type：Poster presentation  

Venue：九州大学  

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Event date： 2018.3.25 - 2018.3.26

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Venue：九州大学  

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Event date： 2018.3.25 - 2018.3.26

Presentation type：Oral presentation (invited, special)  

Venue：九州大学  

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Event date： 2017.11.25 - 2017.11.26

Presentation type：Poster presentation  

Venue：広島大学  

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Event date： 2017.11.25 - 2017.11.26

Presentation type：Poster presentation  

Venue：広島大学  

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Event date： 2017.11.25 - 2017.11.26

Presentation type：Poster presentation  

Venue：広島大学  

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Event date： 2017.11.25 - 2017.11.26

Presentation type：Poster presentation  

Venue：広島大学  

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Event date： 2017.11.25 - 2017.11.26

Presentation type：Poster presentation  

Venue：広島大学  

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Event date： 2017.11.16 - 2017.11.17

Presentation type：Symposium, workshop panel (nominated)  

Venue：国立遺伝学研究所  

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Event date： 2017.11.5 - 2017.11.6

Presentation type：Symposium, workshop panel (nominated)  

Venue：The Hue Learning Resource Center (LRC), Hue University  

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Event date： 2017.10.7 - 2017.10.8

Presentation type：Oral presentation (general)  

Venue：岩手大学  

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Event date： 2017.10.7 - 2017.10.8

Presentation type：Poster presentation  

Venue：岩手大学  

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Event date： 2017.6.29

Presentation type：Symposium, workshop panel (nominated)  

Venue：沖縄県農業研究センター  

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Event date： 2017.5.29 - 2017.5.31

Presentation type：Poster presentation  

Venue：Seoul, South Korea  

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Event date： 2017.5.29 - 2017.5.31

Presentation type：Symposium, workshop panel (nominated)  

Venue：Seoul, South Korea  

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Event date： 2017.3.29 - 2017.3.30

Presentation type：Oral presentation (general)  

Venue：名古屋大学  

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Event date： 2017.3.29 - 2017.3.30

Presentation type：Poster presentation  

Venue：名古屋大学  

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Event date： 2017.3.29 - 2017.3.30

Presentation type：Poster presentation  

Venue：名古屋大学  

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Event date： 2017.3.4 - 2017.3.5

Presentation type：Oral presentation (general)  

Venue：名城大学  

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Event date： 2017.1.14 - 2017.1.18

Presentation type：Poster presentation  

Venue：San Diego  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Symposium, workshop panel (nominated)  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.10 - 2016.12.11

Presentation type：Poster presentation  

Venue：岡山県倉敷市資源植物科学研究所  

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Event date： 2016.12.8 - 2016.12.9

Presentation type：Oral presentation (general)  

Venue：大分県別府市  

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Event date： 2016.11.30 - 2016.12.2

Presentation type：Oral presentation (general)  

Venue：東京大学海洋研究所  

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Event date： 2016.11.30 - 2016.12.2

Presentation type：Poster presentation  

Venue：東京大学海洋研究所  

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Event date： 2016.10.11 - 2016.10.13

Presentation type：Poster presentation  

Venue：Jinan, China  

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Event date： 2016.10.11 - 2016.10.13

Presentation type：Poster presentation  

Venue：Jina, China  

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Event date： 2016.9.24 - 2016.9.25

Presentation type：Poster presentation  

Venue：鳥取大学  

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Event date： 2016.9.24 - 2016.9.25

Presentation type：Poster presentation  

Venue：鳥取大学  

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Event date： 2016.9.24 - 2016.9.25

Presentation type：Poster presentation  

Venue：鳥取大学  

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Event date： 2016.9.24 - 2016.9.25

Presentation type：Poster presentation  

Venue：鳥取大学  

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Event date： 2016.9.14 - 2016.9.16

Presentation type：Oral presentation (general)  

Venue：東京農工大  

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Event date： 2016.9.6

Presentation type：Poster presentation  

Venue：東京農業大学  

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Event date： 2016.3.21 - 2016.3.22

Presentation type：Poster presentation  

Venue：横浜市立大学  

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Event date： 2016.3.21 - 2016.3.22

Presentation type：Oral presentation (general)  

Venue：横浜市立大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Oral presentation (general)  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Oral presentation (general)  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.12.19 - 2015.12.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.12.18

Presentation type：Oral presentation (general)  

Venue：岡山大学創立50周年記念館  

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Event date： 2015.12.12 - 2015.12.13

Presentation type：Oral presentation (general)  

Venue：小田原箱根商工会議所  

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Event date： 2015.12.5 - 2015.12.6

Presentation type：Poster presentation  

Venue：鳥取大学乾燥地研究センター  

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Event date： 2015.11.19 - 2015.11.20

Presentation type：Oral presentation (general)  

Venue：岡山大学  

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Event date： 2015.11.19 - 2015.11.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.11.19 - 2015.11.20

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2015.11.5

Presentation type：Symposium, workshop panel (nominated)  

Venue：岡山大学農学部  

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Event date： 2015.10.30 - 2015.10.31

Presentation type：Symposium, workshop panel (nominated)  

Venue：岡山大学  

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Event date： 2015.10.29 - 2015.10.30

Presentation type：Oral presentation (general)  

Venue：八王子セミナーハウス  

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Event date： 2015.9.26 - 2015.9.28

Presentation type：Symposium, workshop panel (nominated)  

Venue：徳島大学  

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Event date： 2015.9.11 - 2015.9.12

Presentation type：Symposium, workshop panel (nominated)  

Venue：新潟大学  

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Event date： 2015.9.11 - 2015.9.12

Presentation type：Poster presentation  

Venue：新潟大学  

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Event date： 2015.9.2 - 2015.9.12

Presentation type：Symposium, workshop panel (nominated)  

Venue：新潟大学  

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Event date： 2015.9.2 - 2015.9.4

Presentation type：Poster presentation  

Venue：中部大学  

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Event date： 2015.8.24 - 2015.8.29

Presentation type：Oral presentation (general)  

Venue：Nigeria  

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Event date： 2015.7.10 - 2015.7.12

Presentation type：Symposium, workshop panel (public)  

Venue：東京大学  

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Event date： 2015.7.1 - 2015.7.3

Presentation type：Poster presentation  

Venue：つくば国際会議場  

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Event date： 2015.6.30

Presentation type：Symposium, workshop panel (nominated)  

Venue：ビジョンセンター東京  

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Event date： 2014.12.20 - 2014.12.21

Presentation type：Poster presentation  

Venue：鳥取大学 乾燥地研究センター  

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Event date： 2014.12.20 - 2014.12.21

Presentation type：Poster presentation  

Venue：鳥取大学 乾燥地研究センター  

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Event date： 2014.12.20 - 2014.12.21

Presentation type：Poster presentation  

Venue：鳥取大学 乾燥地研究センター  

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Event date： 2014.12.20 - 2014.12.21

Presentation type：Poster presentation  

Venue：鳥取大学 乾燥地研究センター  

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Event date： 2014.12.20 - 2014.12.21

Presentation type：Poster presentation  

Venue：鳥取大学 乾燥地研究センター  

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Event date： 2014.12.11 - 2014.12.12

Presentation type：Oral presentation (general)  

Venue：都城グリーンホテル  

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Event date： 2014.11.28 - 2014.11.30

Presentation type：Poster presentation  

Venue：Kagoshima, Japan  

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Event date： 2014.11.28 - 2014.11.30

Presentation type：Oral presentation (invited, special)  

Venue：Kagoshima, Japan  

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Event date： 2014.11.28 - 2014.11.30

Presentation type：Poster presentation  

Venue：Kagoshima, Japan  

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Event date： 2014.11.27 - 2014.11.28

Presentation type：Poster presentation  

Venue：愛知県名古屋市  

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Event date： 2014.11.27 - 2014.11.28

Presentation type：Oral presentation (general)  

Venue：愛知県名古屋市  

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Event date： 2014.10.29 - 2014.10.30

Presentation type：Poster presentation  

Venue：理化学研究所発生・再生科学総合研究センター（CDB）  

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Event date： 2014.9.26 - 2014.9.27

Presentation type：Poster presentation  

Venue：南九州大学  

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Event date： 2014.9.26 - 2014.9.27

Presentation type：Oral presentation (general)  

Venue：南九州大学  

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Event date： 2014.9.25 - 2014.9.26

Presentation type：Symposium, workshop panel (nominated)  

Venue：南九州大学  

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Event date： 2014.7.9

Presentation type：Oral presentation (general)  

Venue：国立遺伝学研究所  

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Event date： 2014.3.21 - 2014.3.22

Presentation type：Oral presentation (general)  

Venue：東北大学  

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Event date： 2014.3.21 - 2014.3.22

Presentation type：Symposium, workshop panel (nominated)  

Venue：東北大学  

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Event date： 2014.3.21 - 2014.3.22

Presentation type：Oral presentation (general)  

Venue：東北大学  

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Event date： 2013.12.5 - 2013.12.6

Presentation type：Oral presentation (general)  

Venue：熊本  

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Event date： 2013.12.5 - 2013.12.6

Presentation type：Oral presentation (general)  

Venue：熊本  

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Event date： 2013.12.3 - 2013.12.6

Presentation type：Poster presentation  

Venue：パシフィコ横浜  

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Event date： 2013.11.20 - 2013.11.22

Presentation type：Oral presentation (general)  

Venue：仙台  

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Event date： 2013.11.20 - 2013.11.22

Presentation type：Poster presentation  

Venue：仙台  

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Event date： 2013.10.24 - 2013.10.25

Presentation type：Symposium, workshop panel (nominated)  

Venue：広島・福山市  

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Event date： 2013.10.12 - 2013.10.13

Presentation type：Oral presentation (general)  

Venue：鹿児島大学  

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Event date： 2013.9.24 - 2013.9.25

Presentation type：Poster presentation  

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Event date： 2013.9.24 - 2013.9.25

Presentation type：Poster presentation  

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Event date： 2013.9.24 - 2013.9.25

Presentation type：Symposium, workshop panel (nominated)  

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Event date： 2013.9.8 - 2013.9.10

Presentation type：Poster presentation  

Venue：Amsterdam, Netherland  

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Event date： 2013.9.3 - 2013.9.4

Presentation type：Poster presentation  

Venue：神戸国際会議場  

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Event date： 2013.5.14 - 2013.5.15

Presentation type：Poster presentation  

Venue：London, England  

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Event date： 2013.3.27 - 2013.3.28

Presentation type：Oral presentation (general)  

Venue：東京農業大学  

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Event date： 2013.3.27 - 2013.3.28

Presentation type：Oral presentation (general)  

Venue：東京農業大学  

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Event date： 2013.3.21 - 2013.3.23

Presentation type：Oral presentation (general)  

Venue：岡山大学  

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Event date： 2013.3.6 - 2013.3.8

Presentation type：Poster presentation  

Venue：静岡  

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Event date： 2012.12.8 - 2012.12.9

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2012.12.8 - 2012.12.9

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2012.12.8 - 2012.12.9

Presentation type：Symposium, workshop panel (nominated)  

Venue：岡山大学  

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Event date： 2012.12.8 - 2012.12.9

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2012.12.8 - 2012.12.9

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2012.12.8 - 2012.12.9

Presentation type：Poster presentation  

Venue：岡山大学  

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Event date： 2012.12.6 - 2012.12.7

Presentation type：Oral presentation (general)  

Venue：宮崎  

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Event date： 2012.12.6 - 2012.12.7

Presentation type：Oral presentation (general)  

Venue：宮崎  

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Event date： 2012.11.18 - 2012.11.19

Presentation type：Oral presentation (general)  

Venue：京都  

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Event date： 2012.11.18 - 2012.11.19

Presentation type：Poster presentation  

Venue：京都  

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Event date： 2012.10.9 - 2012.10.12

Presentation type：Poster presentation  

Venue：France  

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Event date： 2012.9.17 - 2012.9.18

Presentation type：Poster presentation  

Venue：Jeju  

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Event date： 2012.9.17 - 2012.9.18

Presentation type：Poster presentation  

Venue：Jeju  

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Event date： 2012.9.17 - 2012.9.18

Presentation type：Poster presentation  

Venue：Jeju  

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Event date： 2012.9.14 - 2012.9.15

Presentation type：Oral presentation (general)  

Venue：京都産業大学  

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Event date： 2012.9.10

Presentation type：Symposium, workshop panel (public)  

Venue：テクノサポート岡山  

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Event date： 2012.8.10

Presentation type：Symposium, workshop panel (nominated)  

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Event date： 2011.9.20 - 2011.9.22

Presentation type：Symposium, workshop panel (nominated)  

Venue：京都大学  

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