2021/10/24 更新

写真a

オカモト サトル
岡本 暁
OKAMOTO Satoru
所属
教育研究院 自然科学系 農学系列 助教
農学部 助教
職名
助教
外部リンク

学位

  • 博士(理学) ( 2009年3月   東京大学 )

研究キーワード

  • ダイズ

  • ミヤコグサ

  • ペプチド

  • シンク‐ソース

  • シロイヌナズナ

  • 道管液

  • 器官間シグナル伝達

研究分野

  • ライフサイエンス / 分子生物学

  • ライフサイエンス / 植物分子、生理科学

  • ライフサイエンス / 植物栄養学、土壌学

経歴

  • 新潟大学   農学部   助教

    2017年12月 - 現在

所属学協会

 

論文

  • PLENTY, a hydroxyprolineO-arabinosyltransferase, negatively regulates root nodule symbiosis inLotus japonicus

    Emiko Yoro, Hanna Nishida, Mari Ogawa-Ohnishi, Chie Yoshida, Takuya Suzaki, Yoshikatsu Matsubayashi, Masayoshi Kawaguchi

    Journal of Experimental Botany   70 ( 2 )   507 - 517   2019年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press (OUP)  

    DOI: 10.1093/jxb/ery364

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  • Long-distance peptide signaling essential for nutrient homeostasis in plants 査読

    Satoru Okamoto, Ryo Tabata, Yoshikatsu Matsubayashi

    CURRENT OPINION IN PLANT BIOLOGY   34   35 - 40   2016年12月

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    記述言語:英語   出版者・発行元:CURRENT BIOLOGY LTD  

    Organ-to-organ communication is indispensable for higher organisms to maintain homeostasis over their entire life. Recent findings have uncovered that plants, like animals, mediate organ-to-organ communication by long-distance signaling through the vascular system. In particular, xylem-mobile secreted peptides have attracted much attention as root-to shoot long-distance signaling molecules in response to fluctuating environmental nutrient status. Several leguminous CLE peptides induced by rhizobial inoculation act as 'satiety' signals in long-distance negative feedback of nodule formation. By contrast, Arabidopsis CEP family peptides induced by local nitrogen (N)-starvation behave as systemic 'hunger' signals to promote compensatory N acquisition in other parts of the roots. Xylem sap peptidomics also implies the presence of still uncharacterized long-distance signaling peptides. This review highlights the current understanding of and new insights into the mechanisms and functions of root-to-shoot long-distance peptide signaling during environmental responses.

    DOI: 10.1016/j.pbi.2016.07.009

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  • A comprehensive strategy for identifying long-distance mobile peptides in xylem sap 査読

    Satoru Okamoto, Takamasa Suzuki, Masayoshi Kawaguchi, Tetsuya Higashiyama, Yoshikatsu Matsubayashi

    PLANT JOURNAL   84 ( 3 )   611 - 620   2015年11月

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

    There is a growing awareness that secreted peptides mediate organ-to-organ communication in higher plants. Xylem sap peptidomics is an effective but challenging approach for identifying long-distance mobile peptides. In this study we developed a simple, gel-free purification system that combines o-chlorophenol extraction with HPLC separation. Using this system, we successfully identified seven oligopeptides from soybean xylem sap exudate that had one or more post-transcriptional modifications: glycosylation, sulfation and/or hydroxylation. RNA sequencing and quantitative PCR analyses showed that the peptide-encoding genes are expressed in multiple tissues. We further analyzed the long-distance translocation of four of the seven peptides using gene-encoding peptides with single amino acid substitutions, and identified these four peptides as potential root-to-shoot mobile oligopeptides. Promoter-GUS analysis showed that all four peptide-encoding genes were expressed in the inner tissues of the root endodermis. Moreover, we found that some of these peptide-encoding genes responded to biotic and/or abiotic factors. These results indicate that our purification system provides a comprehensive approach for effectively identifying endogenous small peptides and reinforce the concept that higher plants employ various peptides in root-to-shoot signaling.

    DOI: 10.1111/tpj.13015

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  • Shoot HAR1 mediates nitrate inhibition of nodulation in Lotus japonicus 査読

    Satoru Okamoto, Masayoshi Kawaguchi

    PLANT SIGNALING & BEHAVIOR   10 ( 5 )   e1000138   2015年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS INC  

    Nitrate is a major environmental factor in the inhibition of nodulation. In a model legume Lotus japonicus, a CLV1-like receptor kinase, HAR1, mediates nitrate inhibition and autoregulation of nodulation. Autoregulation of nodulation involves root-to-shoot-to-root long-distance communication, and HAR1 functions in shoots. However, it remains elusive where HAR1 functions in the nitrate inhibition of nodulation. We performed grafting experiments with the har1 mutant under various nitrate conditions, and found that shoot HAR1 is critical for the inhibition of nodulation at 10mM nitrate. Combined with our recent finding that the nitrate-induced CLE-RS2 glycopeptide binds directly to the HAR1 receptor, this result suggests that CLE-RS2/HAR1 long-distance signaling plays an important role in the both nitrate inhibition and the autoregulation of nodulation.

    DOI: 10.1080/15592324.2014.1000138

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  • Dynamics of long-distance signaling via plant vascular tissues 査読

    Michitaka Notaguchi, Satoru Okamoto

    FRONTIERS IN PLANT SCIENCE   6   161   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:FRONTIERS RESEARCH FOUNDATION  

    Plant vascular systems are constructed by specific cell wall modifications through which cells are highly specialized to make conduits for water and nutrients. Xylem vessels are formed by thickened cell walls that remain after programmed cell death, and serve as water conduits from the root to the shoot. In contrast, phloem tissues consist of a complex of living cells, including sieve tube elements and their neighboring companion cells, and translocate photosynthetic assimilates from mature leaves to developing young tissues. Intensive studies on the content of vascular flow fluids have unveiled that plant vascular tissues transport various types of gene product, and the transport of some provides the molecular basis for the long-distance communications. Analysis of xylem sap has demonstrated the presence of proteins in the xylem transpiration stream. Recent studies have revealed that CLE and CEP peptides secreted in the roots are transported to above ground via the xylem in response to plant-microbe interaction and soil nitrogen starvation, respectively. Their leucine-rich repeat transmembrane receptors localized in the shoot phloem are required for relaying the signal from the shoot to the root. These findings well fit to the current scenario of root-to-shoot-to-root feedback signaling, where peptide transport achieves the root-to-shoot signaling, the first half of the signaling process. Meanwhile, it is now well-evidenced that proteins and a range of RNAs are transported via the phloem translocation system, and some of those can exert their physiological functions at their destinations, including roots. Thus, plant vascular systems may serve not only as conduits for the translocation of essential substances but also as long-distance communication pathways that allow plants to adapt to changes in internal and external environments at the whole plant level.

    DOI: 10.3389/fpls.2015.00161

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  • Root-derived CLE glycopeptides control nodulation by direct binding to HAR1 receptor kinase 査読

    Satoru Okamoto, Hidefumi Shinohara, Tomoko Mori, Yoshikatsu Matsubayashi, Masayoshi Kawaguchi

    NATURE COMMUNICATIONS   4   2191   2013年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATURE PUBLISHING GROUP  

    Leguminous plants establish a symbiosis with rhizobia to enable nitrogen fixation in root nodules under the control of the presumed root-to-shoot-to-root negative feedback called autoregulation of nodulation. In Lotus japonicus, autoregulation is mediated by CLE-RS genes that are specifically expressed in the root, and the receptor kinase HAR1 that functions in the shoot. However, the mature functional structures of CLE-RS gene products and the molecular nature of CLE-RS/HAR1 signalling governed by these spatially distant components remain elusive. Here we show that CLE-RS2 is a post-translationally arabinosylated glycopeptide derived from the CLE domain. Chemically synthesized CLE-RS glycopeptides cause significant suppression of nodulation and directly bind to HAR1 in an arabinose-chain and sequence-dependent manner. In addition, CLE-RS2 glycopeptide specifically produced in the root is found in xylem sap collected from the shoot. We propose that CLE-RS glycopeptides are the long sought mobile signals responsible for the initial step of autoregulation of nodulation.

    DOI: 10.1038/ncomms3191

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  • Hairy Root Transformation in Lotus japonicus 査読

    Okamoto S, Yoro E, Suzaki T, Kawaguchi M

    bio-protocol   3   e795   2013年6月

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    記述言語:英語  

    DOI: 10.21769/BioProtoc.795

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  • TOO MUCH LOVE, a novel kelch repeat-containing F-box protein, functions in the long-distance regulation of the LEGUME-rhizobium symbiosis 査読

    Masahiro Takahara, Shimpei Magori, Takashi Soyano, Satoru Okamoto, Chie Yoshida, Koji Yano, Shusei Sato, Satoshi Tabata, Katsushi Yamaguchi, Shuji Shigenobu, Naoya Takeda, Takuya Suzaki, Masayoshi Kawaguchi

    Plant and Cell Physiology   54 ( 4 )   433 - 447   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The interaction of legumes with N2-fixing bacteria collectively called rhizobia results in root nodule development. The number of nodules formed is tightly restricted through the systemic negative feedback control by the host called autoregulation of nodulation (AON). Here, we report the characterization and gene identification of TOO MUCH LOVE (TML), a root factor that acts during AON in a model legume Lotus japonicus. In our genetic analyses using another root-regulated hypernodulation mutant, plenty, the tml-1 plenty double mutant showed additive effects on the nodule number, whereas the tml-1 har1-7 double mutant did not, suggesting that TML and PLENTY act in different genetic pathways and that TML and HAR1 act in the same genetic pathway. The systemic suppression of nodule formation by CLE-RS1/RS2 overexpression was not observed in the tml mutant background, indicating that TML acts downstream of CLE-RS1/RS2. The tml-1 Snf2 double mutant developed an excessive number of spontaneous nodules, indicating that TML inhibits nodule organogenesis. Together with the determination of the deleted regions in tml-1/-2/-3, the fine mapping of tml-4 and the next-generation sequencing analysis, we identified a nonsense mutation in the Kelch repeat-containing F-box protein. As the gene knockdown of the candidate drastically increased the number of nodules, we concluded that it should be the causative gene. An expression analysis revealed that TML is a root-specific gene. In addition, the activity of ProTML-GUS was constitutively detected in the root tip and in the nodules/nodule primordia upon rhizobial infection. In conclusion, TML is a root factor acting at the final stage of AON. © 2013 The Author 2013. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oup.com.

    DOI: 10.1093/pcp/pct022

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  • Expression and Functional Analysis of a CLV3-Like Gene in the Model Legume Lotus japonicus 査読

    Satoru Okamoto, Tomomi Nakagawa, Masayoshi Kawaguchi

    PLANT AND CELL PHYSIOLOGY   52 ( 7 )   1211 - 1221   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS  

    Plant aerial parts are differentiated from stem cells that are located in the shoot apical meristem (SAM). CLAVATA3 (CLV3)-CLV1 is a well-known ligand-receptor pair, which functions in SAM maintenance. In Lotus japonicus, HYPERNODULATION ABERRANT ROOT FORMATION1 (HAR1) shows the highest similarity with CLV1 of all Arabidopsis receptor-like kinases (RLKs). However, HAR1 functions in the systemic regulation of root nodule development, but does not appear to function in SAM maintenance. Therefore, the gene that is responsible for SAM maintenance in L. japonicus is largely unknown. Here, we identified the L. japonicus CLV3-like (LjCLV3) gene as a counterpart of AtCLV3 and performed expression and functional analysis. LjCLV3 transcripts were detected in the central region of the shoot meristems. However, unlike AtCLV3, LjCLV3 expression was not detected in the epidermal layer, but in the inner layers of the shoot meristems. RNA interference (RNAi) of LjCLV3 caused enlargement of not only the SAM, but also the primary and secondary inflorescence meristems (IMs). Furthermore, LjCLV3-silenced plants exhibited fasciated stems and an increased number of flowers per peduncle. These results reveal that LjCLV3 is responsible for the maintenance of the SAM as well as the primary and secondary IMs.

    DOI: 10.1093/pcp/pcr071

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  • The Clavata2 genes of pea and Lotus japonicus affect autoregulation of nodulation 査読

    Lene Krusell, Naoto Sato, Izumi Fukuhara, Bjorn E. V. Koch, Christina Grossmann, Satoru Okamoto, Erika Oka-Kira, Yoko Otsubo, Gregoire Aubert, Tomomi Nakagawa, Shusei Sato, Satoshi Tabata, Gerard Duc, Martin Parniske, Trevor L. Wang, Masayoshi Kawaguchi, Jens Stougaard

    PLANT JOURNAL   65 ( 6 )   861 - 871   2011年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    The number of root nodules developing on legume roots after rhizobial infection is controlled by the plant shoot through autoregulation and mutational inactivation of this mechanism leads to hypernodulation. We have characterised the Pisum sativum (pea) Sym28 locus involved in autoregulation and shown that it encodes a protein similar to the Arabidopsis CLAVATA2 (CLV2) protein. Inactivation of the PsClv2 gene in four independent sym28 mutant alleles, carrying premature stop codons, results in hypernodulation of the root and changes to the shoot architecture. In the reproductive phase sym28 shoots develops additional flowers, the stem fasciates, and the normal phyllotaxis is perturbed. Mutational substitution of an amino acid in one leucine rich repeat of the corresponding Lotus japonicus LjCLV2 protein results in increased nodulation. Similarly, down-regulation of the Lotus Clv2 gene by RNAi mediated reduction of the transcript level also resulted in increased nodulation. Gene expression analysis of LjClv2 and Lotus hypernodulation aberrant root formation Har1 (previously shown to regulate nodule numbers) indicated they have overlapping organ expression patterns. However, we were unable to demonstrate a direct protein-protein interaction between LjCLV2 and LjHAR1 proteins in contrast to the situation between equivalent proteins in Arabidopsis. LjHAR1 was localised to the plasma membrane using a YFP fusion whereas LjCLV2-YFP localised to the endoplasmic reticulum when transiently expressed in Nicotiana benthamiana leaves. This finding is the most likely explanation for the lack of interaction between these two proteins.

    DOI: 10.1111/j.1365-313X.2010.04474.x

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  • Nod factor/nitrate-induced CLE genes that drive HAR1-mediated systemic regulation of nodulation. 査読

    Satoru Okamoto, Erika Ohnishi, Shusei Sato, Hirokazu Takahashi, Mikio Nakazono, Satoshi Tabata, Masayoshi Kawaguchi

    Plant & cell physiology   50 ( 1 )   67 - 77   2009年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Host legumes control root nodule numbers by sensing external and internal cues. A major external cue is soil nitrate, whereas a feedback regulatory system in which earlier formed nodules suppress further nodulation through shoot-root communication is an important internal cue. The latter is known as autoregulation of nodulation (AUT), and is believed to consist of two long-distance signals: a root-derived signal that is generated in infected roots and transmitted to the shoot; and a shoot-derived signal that systemically inhibits nodulation. In Lotus japonicus, the leucine-rich repeat receptor-like kinase, HYPERNODULATION ABERRANT ROOT FORMATION 1 (HAR1), mediates AUT and nitrate inhibition of nodulation, and is hypothesized to recognize the root-derived signal. Here we identify L. japonicus CLE-Root Signal 1 (LjCLE-RS1) and LjCLE-RS2 as strong candidates for the root-derived signal. A hairy root transformation study shows that overexpressing LjCLE-RS1 and -RS2 inhibits nodulation systemically and, furthermore, that the systemic suppression depends on HAR1. Moreover, LjCLE-RS2 expression is strongly up-regulated in roots by nitrate addition. Based on these findings, we propose a simple model for AUT and nitrate inhibition of nodulation mediated by LjCLE-RS1, -RS2 peptides and the HAR1 receptor-like kinase.

    DOI: 10.1093/pcp/pcn194

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  • Expression of LjENOD40 genes in response to symbiotic and non-symbiotic signals: LjENOD40-1 and LjENOD40-2 are differentially regulated in lotus japonicus 査読

    N Takeda, S Okamoto, M Hayashi, Y Murooka

    PLANT AND CELL PHYSIOLOGY   46 ( 8 )   1291 - 1298   2005年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS  

    Nitrogen fixation in nodules provides leguminous plants with an ability to grow in nitrogen-starved soil. Infection of the host plants by microsymbionts triggers various physiological and morphological changes during nodule formation. In Lotus japonicus, expression of early nodulin (ENOD) genes is triggered by perception of bacterial signal molecules, nodulation factors (Nod factors). We examined the expression patterns of ENOD40 genes during the nodule formation process. Two ENOD40 genes of L. japonicus were specifically expressed in the nodule formation process, but they showed different expression patterns upon infection. Each ENOD40 gene demonstrates an individual specificity and regulation with regard to rhizobial infection.

    DOI: 10.1093/pcp/pci138

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書籍等出版物

  • 植物のシグナル伝達

    岡本 暁( 担当: 分担執筆 ,  範囲: 根粒形成のシステミックな抑制をひき起こす誘導性CLE遺伝子)

    共立出版  2010年5月 

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MISC

  • Functional analysis of CLAVATA2, CLAVATA3 like genes in Lotus japonicus

    Satoru Okamoto, Naoto Satou, Erika Kira, Tomomi Nakagawa, Izumi Hukuhara, Syusei Satou, Satoshi Tabata, Perry Jillian, Wang Trevor, Masayoshi Kawaguchi

    PLANT AND CELL PHYSIOLOGY   48   S193 - S193   2007年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Identification of antisense RNA from LjENOD40

    S Okamoto, Y Murooka, M Hayashi

    PLANT AND CELL PHYSIOLOGY   46   S122 - S122   2005年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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講演・口頭発表等

  • 根の成長とスクロース含量の維持に関わる長距離移行性ペプチド

    岡本暁, 川崎梓, 牧野由美子, 石田喬志, 澤進一郎

    第62回日本植物生理学会年会  2021年3月 

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    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(指名)  

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  • A study of root-to-shoot long-distance mobile peptides 招待

    Satoru Okamoto

    International Workshop on Plant Nutritional Responses 2019  2019年12月 

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    開催年月日: 2019年12月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • ペプチドを介した根から地上部への長距離コミュニケーション 招待

    岡本暁

    第60回新潟生化学懇話会  2019年7月 

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    開催年月日: 2019年7月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

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  • 道管液中の低分子タンパク・ペプチドの網羅的な解析

    岡本暁, 牧野由美子

    日本作物学会第247回講演会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:日本語   会議種別:ポスター発表  

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  • 異なる栄養環境における道管液中の低分子タンパク・ペプチドの網羅的な解析

    岡本暁, 小堀峻吾, 熊石妃恵, 牧野由美子, 鈴木孝征, 市橋泰範

    第60回日本植物生理学会年会  2019年3月 

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    開催年月日: 2019年3月

    会議種別:ポスター発表  

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  • 異なる窒素栄養条件に応答したOryza longistaminataの地下茎を介したラメット間情報輸送に関する研究

    河合美里, 本田遥乃, 岡本暁, 大橋美和, 榊原均

    第60回日本植物生理学会年会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:日本語   会議種別:ポスター発表  

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  • 野生イネOryza longistaminataの窒素栄養応答における地上茎間の相互作用の解析

    岡本暁, Stefan Reuscher, 鈴木孝征, 小島美紀子, 竹林裕美子, 芦刈基行, 榊原均

    第60回日本植物生理学会年会  2017年3月 

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    開催年月日: 2017年3月

    記述言語:日本語   会議種別:ポスター発表  

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  • Long-distance mobile peptides in xylem sap

    Satoru Okamoto, Takamasa Suzuki, Masayoshi Kawaguchi, Tetsuya Higashiyama, Yoshikatsu Matsubayashi

    CSHA meeting on Latest Advances in Plant Development & Environmental Response  2016年11月 

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    開催年月日: 2016年11月 - 2016年12月

    記述言語:英語   会議種別:ポスター発表  

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  • ダイズ道管液における長距離移行性ペプチドの探索

    岡本暁, 鈴木孝征, 川口正代司, 東山哲也, 松林嘉克

    第57回日本植物生理学会年会  2016年3月 

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    開催年月日: 2016年3月

    記述言語:日本語   会議種別:ポスター発表  

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  • ダイズ道管液における長距離移行性ペプチドの探索

    岡本暁, 鈴木孝征, 川口正代司, 東山哲也, 松林嘉克

    植物化学調節学会第50 回大会  2015年10月 

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    開催年月日: 2015年10月

    記述言語:日本語   会議種別:ポスター発表  

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  • Long-distance mobile peptides in xylem sap

    Satoru Okamoto, Takamasa Suzuki, Masayoshi Kawaguchi, Tetsuya Higashiyama, Yoshikatsu Matsubayashi

    3rd European workshop on plant peptide signalling and activity  2015年9月 

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    開催年月日: 2015年9月

    記述言語:英語   会議種別:口頭発表(一般)  

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受賞

  • Fellowship Award

    2016年12月   Cold Spring Harbor Asia  

    岡本 暁

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  • 優秀発表賞

    2015年10月   植物化学調節学会  

    岡本 暁

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  • PCP論文賞

    2011年7月   日本植物生理学会  

    岡本 暁

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共同研究・競争的資金等の研究

  • 炭素源の欠乏に関連して発現誘導される長距離移行性分泌型ペプチドの機能解析

    2015年4月 - 2017年3月

    日本学術振興会  若手研究B 

    岡本 暁

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    担当区分:研究代表者  資金種別:競争的資金

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  • 高等植物における分泌型ペプチドの器官間・細胞間移行の解析

    2012年4月 - 2015年3月

    日本学術振興会  特別研究員奨励費 

    岡本 暁

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    担当区分:研究代表者  資金種別:競争的資金

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担当経験のある授業科目(researchmap)

  • 作物生理学

    2019年6月
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    現在
    機関名:新潟大学

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担当経験のある授業科目

  • 植物生産学演習I

    2021年
    -
    現在
    機関名:新潟大学

  • 植物生産学実験実習Ⅲ

    2020年
    -
    現在
    機関名:新潟大学

  • 農学入門Ⅰ

    2020年
    -
    現在
    機関名:新潟大学

  • 植物生産学実験実習Ⅳ

    2020年
    -
    現在
    機関名:新潟大学

  • 農学入門Ⅱ

    2020年
    -
    現在
    機関名:新潟大学

  • 作物学Ⅰ

    2019年
    -
    現在
    機関名:新潟大学

  • 植物生産実地見学

    2019年
    -
    現在
    機関名:新潟大学

  • 植物生産学演習Ⅱ

    2019年
    -
    現在
    機関名:新潟大学

  • 植物生産学実験実習Ⅱ

    2019年
    -
    現在
    機関名:新潟大学

  • 植物生産学実験実習Ⅰ

    2018年
    -
    現在
    機関名:新潟大学

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