Faculty Profiles - MA Jian Feng

Papers - MA Jian Feng

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Bioimaging of multiple elements by high-resolution LA-ICP-MS reveals altered distribution of mineral elements in the nodes of rice mutants Reviewed

Naoki Yamaji, Jian Feng Ma

PLANT JOURNAL 99 ( 6 ) 1254 - 1263 2019.9

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

Inter-vascular transfer in rice (Oryza sativa) nodes is required for delivering mineral elements to developing tissues, which is mediated by various transporters in the nodes. However, the effect of these transporters on distribution of mineral elements in the nodes at a cellular level is still unknown. Here, we established a protocol for bioimaging of multiple elements at a cellular level in rice node by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), and compared the mineral distribution profile between wild-type (WT) rice and mutants. Both relative comparison of mineral distribution normalized by endogenous C-13 and quantitative analysis using spiked standards combined with soft ablation gave valid results. Overall, macro-nutrients such as K and Mg were accumulated more in the phloem region, while micro-nutrients such as Fe and Zn were highly accumulated at the inter-vascular tissues of the node. In mutants of nodal Zn transporter OsHMA2, Zn localization pattern in the node tissues did not differ from that of WT; however, Zn accumulation in the inter-vascular tissues was lower in uppermost node I but higher in the third upper node III compared with the WT. In contrast, Si deposition in the mutants of three nodal Si transporters Lsi2, Lsi3 and Lsi6 showed different patterns, which are consistent with the localization of these transporters. This improved LA-ICP-MS analysis combined with functional characterization of transporters will provide further insight into mineral element distribution mechanisms in rice and other plant species.

DOI： 10.1111/tpj.14410

The Soybean Sugar Transporter GmSWEET15 Mediates Sucrose Export from Endosperm to Early Embryo

Shoudong Wang, Kengo Yokosho, Runze Guo, James Whelan, Yong-Ling Ruan, Jian Feng Ma, Huixia Shou

PLANT PHYSIOLOGY 180 ( 4 ) 2133 - 2141 2019.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER SOC PLANT BIOLOGISTS

Soybean (Glycine max) seed is primarily composed of a mature embryo that provides a major source of protein and oil for humans and other animals. Early in development, the tiny embryos grow rapidly and acquire large quantities of sugars from the liquid endosperm of developing seeds. An insufficient supply of nutrients from the endosperm to the embryo results in severe seed abortion and yield reduction. Hence, an understanding of the molecular basis and regulation of assimilate partitioning involved in early embryo development is important for improving soybean seed yield and quality. Here, we used expression profiling analysis to show that two paralogous sugar transporter genes from the SWEET (Sugars Will Eventually be Exported Transporter) family, GmSWEET15a and GmSWEET15b, were highly expressed in developing soybean seeds. In situ hybridization and quantitative real-time PCR showed that both genes were mainly expressed in the endosperm at the cotyledon stage. GmSWEET15b showed both efflux and influx activities for sucrose in Xenopus oocytes. In Arabidopsis (Arabidopsis thaliana), knockout of three AtSWEET alleles is required to see a defective, but not lethal, embryo phenotype, whereas knockout of both GmSWEET15 genes in soybean caused retarded embryo development and endosperm persistence, resulting in severe seed abortion. In addition, the embryo sugar content of the soybean knockout mutants was greatly reduced. These results demonstrate that the plasma membrane sugar transporter, GmSWEET15, is essential for embryo development in soybean by mediating Suc export from the endosperm to the embryo early in seed development.

DOI： 10.1104/pp.19.00641

In defence of the selective transport and role of silicon in plants

Devrim Coskun, Rupesh Deshmukh, Humira Sonah, James G. Menzies, Olivia Reynolds, Jian Feng Ma, Herbert J. Kronzucker, Richard R. Belanger

NEW PHYTOLOGIST 223 ( 2 ) 514 - 516 2019.7

Producing cadmium-free Indica rice by overexpressing OsHMA3

Chenni Lu, Lingxiao Zhang, Zhong Tang, Xin-Yuan Huang, Jian Feng Ma, Fang-Jie Zhao

ENVIRONMENT INTERNATIONAL 126 619 - 626 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Background: Considerable proportions of rice grains produced in some areas in southern China contain high concentrations of cadmium (Cd), leading to unsafe levels of dietary Cd intake. Cultivars of Indica rice, widely grown in southern China, are particularly prone to high Cd accumulation in the grain. Effective methods are needed to decrease Cd accumulation in Indica rice.Methods: OsHMA3, encoding a tonoplast Cd transporter, was overexpressed in an elite Indica rice cultivar (Zhongjiazao 17) driven by CaMV 35S promoter. The effects on Cd translocation, accumulation and tolerance, as well as on the agronomic traits and micronutrient concentrations were evaluated.Results: OsHMA3 overexpression markedly decreased Cd translocation from roots to shoots and increased Cd tolerance. OsHMA3 overexpression decreased Cd concentrations in brown rice by 94-98%, to levels just above the detection limit, when rice plants were grown in two Cd-contaminated paddy soils. OsHMA3 overexpression generally had no significant effect on grain yield and the concentrations of the essential micronutrients including zinc, iron, copper and manganese in field trials.Conclusion: Overexpression of OsHMA3 is a highly effective method to reduce Cd accumulation in Indica rice, producing rice grains that were almost Cd free with little effect on grain yield or essential micronutrient concentrations.

DOI： 10.1016/j.envint.2019.03.004

The tonoplast-localized transporter OsHMA3 plays an important role in maintaining Zn homeostasis in rice

Hongmei Cai, Sheng Huang, Jing Che, Naoki Yamaji, Jian Feng Ma

JOURNAL OF EXPERIMENTAL BOTANY 70 ( 10 ) 2717 - 2725 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS

In order to respond to fluctuating zinc (Zn) in the environment, plants must have a system to control Zn homeostasis. However, how plants maintain an appropriate level of Zn during their growth and development is still poorly understood. In this study, we found that OsHMA3, a tonoplast-localized transporter for Zn/Cd, plays an important role in Zn homeostasis in rice. Accessions with the functional allele of OsHMA3 showed greater tolerance to high Zn than those with the non-functional allele based on root elongation test. A 67Zn-labeling experiment showed that accessions with loss of function of OsHMA3 had lower Zn accumulation in the roots but similar concentrations in the shoots compared with functional OsHMA3 accessions. When exposed to Zn-free growing medium, the concentration in the root cell sap was rapidly decreased in accessions with functional OsHMA3, but less dramatic changes were observed in non-functional accessions. A mobility experiment showed that more Zn in the roots was translocated to the shoots in accessions with functional OsHMA3. Higher expression levels of OsZIP4, OsZIP5, OsZIP8, and OsZIP10 were found in the roots of accessions with functional OsHMA3 in response to Zn deficiency. Taken together, our results indicate that OsHMA3 plays an important role in rice roots in both Zn detoxification and storage by sequestration into the vacuoles, depending on Zn concentration in the environment.

DOI： 10.1093/jxb/erz091

A nodule-localized phosphate transporter GmPT7 plays an important role in enhancing symbiotic N-2 fixation and yield in soybean Reviewed

Liyu Chen, Lu Qin, Lili Zhou, Xinxin Li, Zhichang Chen, Lili Sun, Wenfei Wang, Zhihao Lin, Jing Zhao, Naoki Yamaji, Jian Feng Ma, Mian Gu, Guohua Xu, Hong Liao

NEW PHYTOLOGIST 221 ( 4 ) 2013 - 2025 2019.3

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

Symbiotic nitrogen (N-2) fixation plays a vital role in sustainable agriculture. Efficient N-2 fixation requires various materials, including phosphate (Pi); however, the molecular mechanism underlying the transport of Pi into nodules and bacteroids remains largely unknown. A nodule-localized Pi transporter, GmPT7, was functionally characterized in soybean (Glycine max) and its role in N-2 fixation and yield was investigated via composite and whole transgenic plants. GmPT7 protein was localized to the plasma membrane and showed transport activity for Pi in yeast. Altered expression of GmPT7 changed (33)Pi uptake from rhizosphere and translocation to bacteroids. GmPT7 was mainly localized to the outer cortex and fixation zones of the nodules. Overexpression of GmPT7 promoted nodulation, and increased plant biomass, shoot nitrogen and phosphorus content, resulting in improved soybean yield by up to 36%. Double suppression of GmPT5 and GmPT7 led to nearly complete elimination of nodulation and over 50% reduction in plant biomass, shoot nitrogen and phosphorus content, indicating that both GmPT7 and GmPT5 contribute to Pi transport for N-2 fixation. Taken together, our results indicate that GmPT7 is a transporter responsible for direct Pi entry to nodules and further to fixation zones, which is required for enhancing symbiotic N-2 fixation and grain yield of soybean.

DOI： 10.1111/nph.15541

OsPHT1;3 Mediates Uptake, Translocation, and Remobilization of Phosphate under Extremely Low Phosphate Regimes Reviewed

Ming Xing Chang, Mian Gu, Yu Wei Xia, Xiao Li Dai, Chang Rong Dai, Jun Zhang, Shi Chao Wang, Hong Ye Qu, Naoki Yamaji, Jian Feng Ma, Guo Hua Xu

PLANT PHYSIOLOGY 179 ( 2 ) 656 - 670 2019.2

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER SOC PLANT BIOLOGISTS

Plant roots rely on inorganic orthophosphate (Pi) transporters to acquire soluble Pi from soil solutions that exists at micromolar levels in natural ecosystems. Here, we functionally characterized a rice (Oryza sativa) Pi transporter, Os Phosphate Transporter1;3 (OsPHT1;3), that mediates Pi uptake, translocation, and remobilization. OsPHT1;3 was directly regulated by Os Phosphate Starvation Response-2 and, in response to Pi starvation, showed enhanced expression in young leaf blades and shoot basal regions and even more so in roots and old leaf blades. OsPHT1;3 was able to complement a yeast mutant strain defective in five Pi transporters and mediate Pi influx in Xenopus laevis oocytes. Overexpression of OsPHT1;3 led to increased Pi concentration both in roots and shoots. However, unlike that reported for other known OsPHT1 members that facilitate Pi uptake at relatively higher Pi levels, mutation of OsPHT1;3 impaired Pi uptake and root-to-shoot Pi translocation only when external Pi concentration was below 5 mu M. Moreover, in basal nodes, the expression of OsPHT1;3 was restricted to the phloem of regular vascular bundles and enlarged vascular bundles. An isotope labeling experiment with P-32 showed that ospht1;3 mutant lines were impaired in remobilization of Pi from source to sink leaves. Furthermore, overexpression and mutation of OsPHT1;3 led to reciprocal alteration in the expression of OsPHT1;2 and several other OsPHT1 genes. Yeast-two-hybrid, bimolecular fluorescence complementation, and coimmunoprecipitation assays all demonstrated a physical interaction between OsPHT1;3 and OsPHT1;2. Taken together, our results indicate that OsPHT1;3 acts as a crucial factor for Pi acquisition, root-to-shoot Pi translocation, and redistribution of phosphorus in plants growing in environments with extremely low Pi levels.

DOI： 10.1104/pp.18.01097

The controversies of silicon's role in plant biology

Devrim Coskun, Rupesh Deshmukh, Humira Sonah, James G. Menzies, Olivia Reynolds, Jian Feng Ma, Herbert J. Kronzucker, Richard R. Belanger

NEW PHYTOLOGIST 221 ( 1 ) 67 - 85 2019.1

Language：English Publisher：WILEY

Silicon (Si) is not classified as an essential plant nutrient, and yet numerous reports have shown its beneficial effects in a variety of species and environmental circumstances. This has created much confusion in the scientific community with respect to its biological roles. Here, we link molecular and phenotypic data to better classify Si transport, and critically summarize the current state of understanding of the roles of Si in higher plants. We argue that much of the empirical evidence, in particular that derived from recent functional genomics, is at odds with many of the mechanistic assertions surrounding Si's role. In essence, these data do not support reports that Si affects a wide range of molecular-genetic, biochemical and physiological processes. A major reinterpretation of Si's role is therefore needed, which is critical to guide future studies and inform agricultural practice. We propose a working model, which we term the 'apoplastic obstruction hypothesis', which attempts to unify the various observations on Si's beneficial influences on plant growth and yield. This model argues for a fundamental role of Si as an extracellular prophylactic agent against biotic and abiotic stresses (as opposed to an active cellular agent), with important cascading effects on plant form and function.

DOI： 10.1111/nph.15343

OsCASP1 is required for casparian strip formation at endodermal cells of rice roots for selective uptake of mineral elements

Zhigang Wang, Naoki Yamaji, Sheng Huang, Xiang Zhang, Mingxing Shi, Shan Fu, Guangzhe Yang, Jian Feng Ma, Jixing Xia

Plant Cell 31 ( 11 ) 2636 - 2648 2019

Publishing type：Research paper (scientific journal)

In response to diverse environmental conditions, rice (Oryza sativa) roots have developed one Casparian strip (CS) at the exodermis and one CS at the endodermis. Here, we functionally characterized OsCASP1 (Casparian strip domain protein 1) in rice. OsCASP1 was mainly expressed in the root elongation zone, and the protein encoded was first localized to all sides of the plasma membrane of endodermal cells without CS, followed by the middle of the anticlinal side of endodermal cells with CS. Knockout of OsCASP1 resulted in a defect of CS formation at the endodermis and decreased growth under both soil and hydroponic conditions. Mineral analysis showed that the oscasp1 mutants accumulated more Ca, but less Mn, Zn, Fe, Cd, and As in the shoots compared with the wild type. The growth inhibition of the mutants was further aggravated by high Ca in growth medium. The polar localization of the Si transporter Low Si 1 at the distal side of the endodermis was not altered in the mutant, but the protein abundance was decreased, resulting in a substantial reduction in silicon uptake. These results indicated that OsCASP1 is required for CS formation at the endodermis and that the CS in rice plays an important role in root selective uptake of mineral elements, especially Ca and Si.

DOI： 10.1105/tpc.19.00296

Two Genes Encoding a Bacterial-Type ATP-Binding Cassette Transporter are Implicated in Aluminum Tolerance in Buckwheat

Jing Che, Naoki Yamaji, Kengo Yokosho, Ren Fang Shen, Jian Feng Ma

PLANT AND CELL PHYSIOLOGY 59 ( 12 ) 2502 - 2511 2018.12

Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS

Buckwheat (Fagopyrum esculentum Moench) shows high tolerance to aluminum (Al) toxicity, but the molecular mechanisms underlying its high Al tolerance are poorly understood. Here, we functionally characterized two genes (FeSTAR1 and FeSTAR2), which encode a nucleotide-binding domain and a membrane domain, respectively, of a bacterial-type ATP-binding cassette (ABC) transporter. The expression of FeSTAR1 and FeSTAR2 was induced by Al in both roots and leaves with higher expression in the roots. Spatial and tissue-specific expression analysis showed that the Al-induced expression of these two genes was found in both the root tips and basal root regions with higher expression in the root outer cell layers. The expression was neither induced by other metals including Cd and La nor by low pH and phosphorus-deficiency. FeSTAR1 and FeSTAR2 were present in a single copy in the genome, but the Al-induced transcript copy number of FeSTAR1 and FeSTAR2 was much higher than their homologous genes in rice and Arabidopsis. FeSTAR1 and FeSTAR2 form a complex when co-expressed in onion epidermal cells. Introduction of FeSTAR1 and FeSTAR2 into Arabidopsis mutants atstar1 and als3/atstar2, respectively, rescued the sensitivity of the mutants to Al. Taken together, our results indicate that FeSTAR1 and FeSTAR2 are involved in Al tolerance and that their high expression level may contribute to high Al tolerance in buckwheat.

DOI： 10.1093/pcp/pcy171

Retrotransposon Insertion and DNA Methylation Regulate Aluminum Tolerance in European Barley Accessions Reviewed International journal

Miho Kashino-Fujii, Kengo Yokosho, Naoki Yamaji, Miki Yamane, Daisuke Saisho, Kazuhiro Sato, Jian Feng Ma

PLANT PHYSIOLOGY 178 ( 2 ) 716 - 727 2018.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER SOC PLANT BIOLOGISTS

Aluminum (Al) toxicity is a major stress factor limiting crop productivity in acid soil. Although there is great genotypic variation in tolerance to Al toxicity, the underlying molecular mechanisms are poorly understood. Here, we report that, in barley (Hordeum vulgare), the fourth largest cereal crop produced in the world, both retrotransposon insertion and DNA methylation are involved in regulating differential Al tolerance. HvAACT1 is a major gene responsible for citrate secretion from the roots for external detoxification of Al. A multiretrotransposon-like (MRL) sequence insertion at least 15.3 kb in length was detected in the upstream genomic region of HvAACT1 that displayed promoter activity and significantly enhanced HvAACT1 expression, especially in the root tips of Al-tolerant accessions. Furthermore, in a number of accessions with low levels of HvAACT1 expression, this MRL insertion was present but highly methylated. Geographical analysis showed that accessions with this MRL insertion are distributed mainly in European areas with acid soils. Two wild barley accessions were found to possess this MRL insertion, but with a high degree of methylation. These results indicate that the MRL insertion and its degree of DNA methylation influence HvAACT1 expression and that demethylation of this MRL insertion, which facilitates adaptation to acid soils, occurred following barley domestication. Moreover, our results indicate that barley accessions in East Asia and Europe have developed independent but equivalent strategies to withstand Al toxicity in acid soils.

DOI： 10.1104/pp.18.00651

OsYSL16 is Required for Preferential Cu Distribution to Floral Organs in Rice

Chang Zhang, Wenhui Lu, Yang Yang, Zhenguo Shen, Jian Feng Ma, Luqing Zheng

PLANT AND CELL PHYSIOLOGY 59 ( 10 ) 2039 - 2051 2018.10

Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS

Deficiency of copper (Cu) causes low fertility in many plant species, but the molecular mechanisms underlying distribution of Cu to the floral organs are poorly understood. Here, we found that a member of yellow-stripe like (YSL) family, YSL16 encoding the Cu-nicotianamine (Cu-NA) transporter, was highly expressed in the rachilla, with less expression in the palea and lemma of rice (Oryza sativa). beta-Glucuronidase (GUS) staining of transgenic rice carrying the OsYSL16 promoter-GUS showed that OsYSL16 was mainly expressed in vascular bundles of the rachilla as well as the palea and lemma. Knockout of OsYSL16 resulted in decreased Cu distribution to the stamens, but increased distribution to the palea and lemma. A short-term (24 h) Cu-65 labeling experiment confirmed increased Cu concentration of palea and lemma in the mutant. Furthermore, we found that redistribution of Cu from the palea and lemma was impaired in the osysl16 mutant after exposure to Cu-free solution. The osysl16 mutant showed low pollen germination, but this was rescued by addition of Cu in the medium. Our results indicate that OsYSL16 expressed in the vascular bundles of the rachilla is important for preferential distribution of Cu to the stamens, while OsYSL16 in vascular bundles of the palea and lemma is involved in Cu redistribution under Cu-limited conditions in rice.

DOI： 10.1093/pcp/pcy124

Functional characterization of an aluminum (Al)-inducible transcription factor, ART2, revealed a different pathway for Al tolerance in rice Reviewed

Jing Che, Tomokazu Tsutsui, Kengo Yokosho, Naoki Yamaji, Jian Feng Ma

NEW PHYTOLOGIST 220 ( 1 ) 209 - 218 2018.10

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

High aluminum (Al) tolerance in rice (Oryza sativa) is controlled by a Cys2His2-type zinc finger transcription factor ART1 (Al resistance transcription factor1). There are five close homologs of ART1 in the rice genome, but the role of these homologs is unknown.We functionally characterized one of the ART1 homologs, ART2, in terms of tissue and spatial expression, subcellular localization, transcriptional activation activity, and phenotypic analysis of the knockout lines.ART2 was localized to the nucleus and showed a transcriptional activation potential in yeast. ART2 was mainly expressed in the roots, but the expression level was much lower than that of ART1. The ART2 expression was rapidly induced by Al in the roots of the wild-type rice, but not in art1 mutant. Knockout of ART2 resulted in increased sensitivity to Al toxicity, but did not alter sensitivity to different pH values. Expression profile analysis by RNA-sequencing showed that ART2 was not involved in activation of genes regulated by ART1; however, four genes seems to be regulated by ART2, which are implicated in Al tolerance.These results indicate that ART1 and ART2 regulate different pathways leading to Al tolerance, and ATR2 plays a supplementary role in Al tolerance in rice.

DOI： 10.1111/nph.15252

Engineering rice with lower grain arsenic

Fenglin Deng, Naoki Yamaji, Jian Feng Ma, Sang-Kyu Lee, Jong-Seong Jeon, Enrico Martinoia, Youngsook Lee, Won-Yong Song

PLANT BIOTECHNOLOGY JOURNAL 16 ( 10 ) 1691 - 1699 2018.10

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

Arsenic (As) is a poisonous element that causes severe skin lesions and cancer in humans. Rice (Oryza sativa L.) is a major dietary source of As in humans who consume this cereal as a staple food. We hypothesized that increasing As vacuolar sequestration would inhibit its translocation into the grain and reduce the amount of As entering the food chain. We developed transgenic rice plants expressing two different vacuolar As sequestration genes, ScYCF1 and OsABCC1, under the control of the RCc3 promoter in the root cortical and internode phloem cells, along with a bacterial gamma-glutamylcysteine synthetase driven by the maize UBI promoter. The transgenic rice plants exhibited reduced root-to-shoot and internode-to-grain As translocation, resulting in a 70% reduction in As accumulation in the brown rice without jeopardizing agronomic traits. This technology could be used to reduce As intake, particularly in populations of South East Asia suffering from As toxicity and thereby improve human health.

DOI： 10.1111/pbi.12905

The Putative Peptide Gene FEP1 Regulates Iron Deficiency Response in Arabidopsis

Takashi Hirayama, Gui Jie Lei, Naoki Yamaji, Naoki Nakagawa, Jian Feng Ma

PLANT AND CELL PHYSIOLOGY 59 ( 9 ) 1739 - 1752 2018.9

Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS

Iron is an essential element for all organisms, and plants have developed sophisticated systems to acquire iron and maintain iron homeostasis. We found that an Arabidopsis thaliana ABA-hypersensitive mutant, aba hypersensitive germination2-1 (ahg2-1), that is known to be defective in mitochondrial mRNA regulation, had increased expression of iron deficiency response genes. The ahg2-1 mutant had lower heme levels than the wild type. Transcriptome data further revealed that novel genes encoding short polypeptides were highly expressed in this mutant. The expression of one of these genes, which we named FE-UPTAKE-INDUCING PEPTIDE 1 (FEP1), was induced under iron-deficient conditions and was observed in the vascular tissues of the leaves and roots, as well as in leaf mesophyll cells. Notably, deletion or insertion mutations of FEN exhibited impaired iron accumulation in shoots but normal iron levels in roots. Artificially induced expression of FEP1 was sufficient to induce iron deficiency response genes, such as basic HELIX- LOOP-HELIX 38 (bHLH38), bHLH39, IRON-REGULATED TRANSPORTERI (IRT1) and FERRIC REDUCTION OXIDASE2 (FRO2), and led to iron accumulation in planta. Further analysis confirmed that the encoded peptide, but not the FEP1 RNA, was responsible for this activity. Remarkably, the activation of bHLH39 by FEP1 was independent of FER-LIKE IRON DEFICIENCY INDUCED (FIT), a key transcription factor in the iron deficiency response. Taken together, our results indicate that FEP1 functions in iron homeostasis through a previously undescribed regulatory mechanism for iron acquisition in Arabidopsis.

DOI： 10.1093/pcp/pcy145

A member of cation diffusion facilitator family, MTP11, is required for manganese tolerance and high fertility in rice Reviewed

Yuta Tsunemitsu, Mayuko Genga, Tomoyuki Okada, Naoki Yamaji, Jian Feng Ma, Akira Miyazaki, Shin-ichiro Kato, Kozo Iwasaki, Daisei Ueno

PLANTA 248 ( 1 ) 231 - 241 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

Rice MTP11 is the trans-Golgi-localized transporter that is involved in Mn tolerance with MTP8.1, and it is required for normal fertility.Rice (Oryza sativa L.) is one of the most manganese (Mn)-tolerant species, and it is able to accumulate high levels of this metal in the leaves without showing toxic symptoms. The metal tolerance protein 8.1 (MTP8.1), a member of the Mn-cation diffusion facilitator (CDF) family, has been shown to play a central role in high Mn tolerance by sequestering Mn into vacuoles. Recently, rice MTP11 was identified as an Mn transporter that is localized to Golgi-associated compartments, but its exact role in Mn tolerance in planta has not yet been understood. Here, we investigated the role of MTP11 in rice Mn tolerance using knockout lines. Old leaves presented higher levels of constitutively expressed MTP11 than other tissues and MTP11 expression was also found in reproductive organs. Fused MTP11:green fluorescent protein was co-localized to trans-Golgi markers and differentiated from other Golgi-associated markers. Knockout of MTP11 in wild-type rice did not affect tolerance and accumulation of Mn and other heavy metals, but knockout in the mtp8.1 mutant showed exacerbated Mn sensitivity at the vegetative growth stage. Knockout of MTP11 alone resulted in decreased grain yield and fertility at the reproductive stage. Thus, MTP11 is a trans-Golgi localized transporter for Mn, which plays a role in Mn tolerance through intracellular Mn compartmentalization. It is also required for maintaining high fertility in rice.

DOI： 10.1007/s00425-018-2890-1

Decreasing arsenic accumulation in rice by overexpressing OsNIP1;1 and OsNIP3;3 through disrupting arsenite radial transport in roots

Sheng-Kai Sun, Yi Chen, Jing Che, Noriyuki Konishi, Zhong Tang, Anthony J. Miller, Jian Feng Ma, Fang-Jie Zhao

NEW PHYTOLOGIST 219 ( 2 ) 641 - 653 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

Rice is a major dietary source of the toxic metalloid arsenic. Reducing arsenic accumulation in rice grain is important for food safety.We generated transgenic rice overexpressing two aquaporin genes, OsNIP1;1 and OsNIP3;3, under the control of a maize ubiquitin promoter or the rice OsLsi1 promoter, and tested the effect on arsenite uptake and translocation.OsNIP1;1 and OsNIP3;3 were highly permeable to arsenite in Xenopus oocyte assays. Both transporters were localized at the plasma membrane. Knockout of either gene had little effect on arsenite uptake or translocation. Overexpression of OsNIP1;1 or OsNIP3;3 in rice did not affect arsenite uptake but decreased root-to-shoot translocation of arsenite and shoot arsenic concentration markedly. The overexpressed OsNIP1;1 and OsNIP3;3 proteins were localized in all root cells without polarity. Expression of OsNIP1;1 driven by the OsLsi1 promoter produced similar effects. When grown in two arsenic-contaminated paddy soils, overexpressing lines contained significantly lower arsenic concentration in rice grain than the wild-type without compromising plant growth or the accumulation of essential nutrients.Overexpression of OsNIP1;1 or OsNIP3;3 provides a route for arsenite to leak out of the stele, thus restricting arsenite loading into the xylem. This strategy is effective in reducing arsenic accumulation in rice grain.

DOI： 10.1111/nph.15190

Transcription factor WRKY22 promotes aluminum tolerance via activation of OsFRDL4 expression and enhancement of citrate secretion in rice (Oryza sativa) Reviewed

Ge Zi Li, Zhan Qi Wang, Kengo Yokosho, Bing Ding, Wei Fan, Qiao Qiao Gong, Gui Xin Li, Yun Rong Wu, Jian Li Yang, Jian Feng Ma, Shao Jian Zheng

NEW PHYTOLOGIST 219 ( 1 ) 149 - 162 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

Whilst WRKY transcription factors are known to be involved in diverse plant responses to biotic stresses, their involvement in abiotic stress tolerance is poorly understood. OsFRDL4, encoding a citrate transporter, has been reported to be regulated by ALUMINUM (Al) RESISTANCE TRANSCRIPTION FACTOR 1 (ART1) in rice, but whether it is also regulated by other transcription factors is unknown.We define the role of OsWRKY22 in response to Al stress in rice by using mutation and transgenic complementation assays, and characterize the regulation of OsFRDL4 by OsWRKY22 via yeas one-hybrid, electrophoretic mobility shift assay and ChIP-quantitative PCR.We demonstrate that loss of OsWRKY22 function conferred by the oswrky22 T-DNA insertion allele causes enhanced sensitivity to Al stress, and a reduction in Al-induced citrate secretion. We next show that OsWRKY22 is localized in the nucleus, functions as a transcriptional activator and is able to bind to the promoter of OsFRDL4 via W-box elements. Finally, we find that both OsFRDL4 expression and Al-induced citrate secretion are significantly lower in art1 oswrky22 double mutants than in the respective single mutants.We conclude that OsWRKY22 promotes Al-induced increases in OsFRDL4 expression, thus enhancing Al-induced citrate secretion and Al tolerance in rice.

DOI： 10.1111/nph.15143

Efficient and flexible uptake system for mineral elements in plants Reviewed

Jing Che, Naoki Yamaji, Jian Feng Ma

NEW PHYTOLOGIST 219 ( 2 ) 513 - 517 2018.7

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY

Mineral elements required for plant growth and development must first be taken up by the roots from soil. Plants have developed an efficient uptake system for the radial transport of mineral elements from soil to central stele through the allocation of various transporters at different root cells. These transporters are regulated at transcriptional, translational and/or post-translational level to cope with the fluctuation of mineral elements in soil. In this insight, we describe an efficient uptake system for mineral elements formed by influx and efflux transporters, regulatory mechanisms and polarity of these transporters, and sensing and signal pathways, in response to spatial and temporal changes of mineral elements in soil. An understanding of the mineral element uptake system in different plant species, and its regulatory network, will contribute to high and safe crop production under varying environments.

DOI： 10.1111/nph.15140

Plant nutrition for global green growth

Jan K. Schjoerring, Jian F. Ma, Nicolaus von Wirén

Physiologia Plantarum 163 ( 3 ) 268 2018.7

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