研究者詳細 - 冨田　朝美

論文 - 冨田　朝美

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水稲NERICA品種の農業形質に関する遺伝的要因

冨田朝美, 秋元唯

岡山大学農学部学術報告 113 11 - 16 2024年2月

Diversity of traits related to panicle architecture and grain size in Cambodian rice germplasm and newly developed mini-core collection. 査読

Hiroki Saito, Chhourn Orn, Vathany Thun, Ouk Makara, Asami Tomita, Kazuhiro Sasaki, Mitsuhiro Obara, Nobuya Kobayashi, Yoshimichi Fukuta

JARQ 57 ( 1 ) 21 - 35 2023年1月

Lines for blast resistance genes with genetic background of Indica Group rice as international differential variety set 査読

Yoshimichi Fukuta, Yohei Koide, Nobuya Kobayashi, Hiroshi Kato, Hiroki Saito, Mary Jeanie Telebanco‐Yanoria, Leodegario A. Ebron, Doris Mercado‐Escueta, Hiroshi Tsunematsu, Ikuo Ando, Daisuke Fujita, Mitsuhiro Obara, Asami Tomita, Nagao Hayashi, Tokio Imbe

Plant Breeding 141 ( 5 ) 609 - 620 2022年10月

Characterization of Six Partial Resistance Genes and One Quantitative Trait Locus to Blast Disease Using Near Isogenic Lines with a Susceptible Genetic Background of Indica Group Rice (Oryza sativa) 査読

Hiroki Saito, Asami Tomita, Tomofumi Yoshida, Mitsuru Nakamura, Taro Suzuki, Akihiro Ikeda, Takahiro Kato, Yasunori Nakajima, Ryo Tanimoto, Toshio Tani, Nagao Hayashi, Hideyuki Hirabayashi, Ikuo Ando, Yoshimichi Fukuta

PhytoFrontiers™ 2 ( 3 ) 230 - 241 2022年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Societies

Seven near isogenic lines (NILs) for six partial blast-resistance genes— Pi35, pi21, Pi37(t)( Pi37-KRIL17), Pb1, and Pi34 (two: Pi34-Chubu32 and Pi34-Chugoku40, originating from different Japonica Group rice lines, ‘Chubu 32’ and ‘Chugoku 40’, respectively)—and one quantitative trait locus (QTL), PiPHL9, derived from Japonica Group line ‘Hokkai PL9’, were developed in rice ( Oryza sativa L.). These NILs have the genetic background of an Indica Group susceptible line ‘US-2’, which does not harbor complete resistance genes and can clarify the effects of partial resistance genes and the QTL. These NILs and US-2 were used to determine the effects of the partial resistance genes and the QTL based on the results of an inoculation test for leaf blast using international standard differential blast isolates in the young seedling stage and a natural infection test in the mature stage after heading at a blast field. The NILs produced mainly moderate reactions in the inoculation test and rarely exhibited “resistant” and “susceptible” reactions. Each of the partial resistance genes and the QTL had different effects in panicle blast. Two genes, Pi35 and Pb1, were the most effective with respect to resistance, followed by Pi37-KRIL17. Pi34-Chugoku40 was the weakest. The effects of pi21, Pi34-Chubu32, and PiPHL9 varied among cultivation seasons and could be easily affected by environmental conditions. This is the first report clarifying the effects of partial resistance genes without the major complete genes, which will be helpful for advanced genetic and pathological studies and as a source of genes for rice breeding.

[Formula: see text] Copyright © 2022 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .

DOI： 10.1094/phytofr-06-21-0042-r

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Two Novel QTLs for the Harvest Index that Contribute to High-Yield Production in Rice (Oryza sativa L.). 査読国際誌

Hiroki Saito, Yoshimichi Fukuta, Mitsuhiro Obara, Asami Tomita, Tsutomu Ishimaru, Kazuhiro Sasaki, Daisuke Fujita, Nobuya Kobayashi

Rice (New York, N.Y.) 14 ( 1 ) 18 - 18 2021年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: The harvest index (HI) is a measure of the biological success of forming harvestable products. However, our understanding of the genetic basis of HI in rice (Oryza sativa L.) is limited, because it is a complex trait consisting of various yield-related traits and physiological attributes. YTH183 is a high-yielding line with large panicles and high HI derived from a cross between the Indica Group variety IR 64 and the NPT line IR 69093-41-2-3-2 (YP5). RESULTS: Here, we detected two novel QTLs for HI, designated qHI5.1 on chromosome 5 and qHI8.1 on chromosome 8, by using 155 recombinant inbred lines (RILs) derived from the cross between IR 64 and YTH183. The YTH183 allele at qHI5.1 contributed to a wide grain, resulting in heavy grain weight and panicle weight, and was consistently effective under the different environmental conditions of subtropical (Ishigaki) and temperate (Tsukuba) regions. Genetic polymorphism revealed that qHI5.1 was identical to GSE5/GW5, which is known to control the grain weight. On the other hand, although qHI8.1 functioned additively with qHI5.1 for higher HI, it did not show any significant effect on grain or panicle weight. In addition, its effects on HI were shown only in the first seasons at Ishigaki but not at Tsukuba or in the second season at Ishigaki. CONCLUSION: Our results indicate that qHI5.1 controls the grain size, regardless of whether environmental conditions are of subtropical or temperate regions, while qHI8.1 might be involved in controlling the physiological processes of source ability or the translocation of photosynthesis products from vegetative organs to grains depending on environmental conditions during the maturing stage. These QTLs will be useful genetic resources for future breeding programs to break through the ceiling of maximum yield in Indica Group varieties.

DOI： 10.1186/s12284-021-00456-1

PubMed

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Genetic variation of typhoon-induced spikelet sterility in introgression lines with genetic background of Indica group rice (Oryza sativa L.) variety IR 64 査読

Asami Tomita, Nashir Uddin, Mitsuhiro Obara, Hiroki Saito, Yoshimichi Fukuta

Plant Production Science 24 ( 1 ) 123 - 134 2020年9月

QTL analysis for soil‐surface roots originating from a New Plant Type rice (Oryza sativa). 査読

Plant Breeding 138 1 - 9 2019年

Genetic variation of blast (Pyricularia oryzae Cavara) resistance in rice (Oryza sativa L.) accessions widely used in Kenya 査読

Yoshimichi Fukuta, Tomohisa Suzuki, Seiji Yanagihara, Mitsuhiro Obara, Asami Tomita, Ryo Ohsawa, Catherine Wanjiku Machungo, Nagao Hayashi, Daigo Makihara

BREEDING SCIENCE 69 ( 4 ) 672 - 679 2019年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：JAPANESE SOC BREEDING

A total of 47 rice accessions collected from Kenya were investigated the genetic variations and classified into two cluster groups, A and B, by polymorphism data of 65 simple sequence repeat (SSR) markers. Clusters A and B corresponded to Japonica and Indica Groups, respectively. The number of Japonica Group accessions was limited in comparison with those of the Indica Group. Based on their patterns of reaction to standard differential blast isolates (SDBIs), these accessions and 57 control cultivars including differential varieties and several accessions harboring partial resistance genes were classified again into three cluster groups: Ia (high resistance), Ib (intermediate resistance) and II (susceptible). The rice accessions from Kenya were classified only into groups Ia and Ib. The accessions from Kenya were finally classified into three categories, A-Ia, B-Ia and B-Ib, based on the two classifications of polymorphism of SSR markers and resistance. The Indica Group accessions had wider genetic variation for blast resistance than did the Japonica Group accessions. The three leading cultivars (Basmati 217, Basmati 370 and ITA 310) categorized into Cluster group Ia were susceptible to some SDBIs from Kenya. The genetic variation for blast resistance in Kenya was demonstrated as the first report using SDBIs.

DOI： 10.1270/jsbbs.19065

Web of Science

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Genetic variation of root angle distribution in rice (Oryza sativa L.) seedlings 査読

Asami Tomita, Tadashi Sato, Yusaku Uga, Mitsuhiro Obara, Yoshimichi Fukuta

BREEDING SCIENCE 67 ( 3 ) 181 - 190 2017年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：JAPANESE SOC BREEDING

We developed a new method of using seedling trays to evaluate root angle distribution in rice (Oryza sativa. L), and found a wide genetic variation among cultivars. The seedling tray method can be used to evaluate in detail the growth angles of rice crown roots at the seedling stage by allocating nine scores (10 to 90). Unlike basket methods, it can handle large plant populations over a short growth period (only 14 days). By using the method, we characterized the root angle distributions of 97 accessions into two cluster groups: A and B. The numbers of accessions in group A were limited, and these were categorized as shallow rooting types including soil-surface root. Group B included from shallow to deep rooting types; both included Indica and Japonica Group cultivars, lowland and upland cultivars, and landraces and improved types. No relationship between variation in root vertical angle and total root number was found. The variation in root angle distribution was not related to differentiation between the Japonica and Indica Groups, among ecosystems used for rice cultivation, or among degrees of genetic improvement. The new evaluation method and associated information on genetic variation of rice accessions will be useful in root architecture breeding of rice.

DOI： 10.1270/jsbbs.16185

Web of Science

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Genetic variation in resistance to blast (Pyricularia oryzae Cavara) in rice (Oryza sativa L.) germplasms of Bangladesh 査読

Mohammad Ashik Iqbal Khan, Mohammad Abdul Latif, Mohammad Khalequzzaman, Asami Tomita, Mohammad Ansar Ali, Yoshimichi Fukuta

Breeding Science 67 ( 5 ) 493 - 499 2017年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Japanese Society of Breeding

Genetic variation in blast resistance was clarified in 334 Bangladesh rice accessions from 4 major ecotypes (Aus, Aman, Boro and Jhum). Cluster analysis of polymorphism data of 74 SSR markers separated these accessions into cluster I (corresponding to the Japonica Group) and cluster II (corresponding to the Indica Group). Cluster II accessions were represented with high frequency in all ecotypes. Cluster II was further subdivided into subclusters IIa and IIb. Subcluster IIa accessions were represented with high frequency in only Aus and Jhum ecotypes. Cluster I accessions were more frequent in the Aman ecotype than in other ecotypes. Distinct variations in resistance were found, and accessions were classified into 4 groups (A1, A2, B1 and B2) based on their reactions to standard differential blast isolates. The most susceptible group was A2 (which included susceptible variety Lijiangxintuanheigu, most of the differential varieties, and a few Bangladesh acces-sions), followed in order by A1, B2 and B1 (the most resistant). Accessions from 4 ecotypes fell with different frequencies into each of these resistance groups. These results demonstrated that Japonica Group accessions were found mainly in Aman, and Indica Group accessions were distributed across all ecotypes. Susceptible accessions were limited in Aus and Aman.

DOI： 10.1270/jsbbs.17039

Scopus

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Identification of a low tiller gene from a new plant type cultivar in rice (Oryza sativa L.) 査読

Md. Nashir Uddin, Asami Tomita, Mitsuhiro Obara, Seiji Yanagihara, Yoshimichi Fukuta

BREEDING SCIENCE 66 ( 5 ) 790 - 796 2016年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：JAPANESE SOC BREEDING

We characterized a rice introgression line, YTH34, harboring a chromosome segment from a New Plant Type (NPT) cultivar, IR65600-87-2-2-3, in the genetic background of an Indica Group elite rice cultivar, IR 64, under upland and irrigated lowland conditions in Japan. The number of panicles (as an indicator of tiller number) and number of spikelets per panicle of YTH34 were lower than those of IR 64 under irrigated lowland conditions, but both of those as well as culm length, panicle length, seed fertility, panicle weight, whole plant weight, and harvest index were dramatically reduced under upland conditions. And the low tiller of YTH34 was confirmed to start after the maximum tiller stage. In particular, the decrease of panicle number was remarkable in upland, so we tried to identify the chromosome location of the relevant gene. Through segregation and linkage analyses using F-3 family lines derived from a cross between IR 64 and YTH34, and SSR markers, we found that low tiller number was controlled by a single recessive gene, ltn2, and mapped with the distance of 2.1 cM from SSR marker RM21950, in an introgressed segment on chromosome 7. YTH34 harboring ltn2 and the genetic information for DNA markers linked will be useful for genetic modification of plant architectures of Indica Group rice cultivar.

DOI： 10.1270/jsbbs.16143

Web of Science

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