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2011 Fiscal Year Final Research Report

Root nodulation is controlled by sensing the R/ FR ratio through phytochrome signaling

Research Project

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Project/Area Number 21657017
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeSingle-year Grants
Research Field Plant molecular biology/Plant physiology
Research InstitutionSaga University

Principal Investigator

SUZUKI Akihiro  佐賀大学, 農学部, 准教授 (50305108)

Project Period (FY) 2009 – 2011
Keywords根粒 / 共生 / フィトクロム / 光形態形成 / 植物微生物相互作用 / ジャスモン酸
Research Abstract

Light is critical for supplying carbon to the energetically expensive, nitrogen-fixing symbiosis between legumes and rhizobia. In this study, I show that Phytochrome B(phyB) is part of the monitoring system to detect suboptimal light conditions, which normally suppress Lotus japonicus nodule development following Mesorhizobium loti inoculation. I found that the number of nodules produced by L. japonicus phyB mutants is significantly reduced compared to that of wild-type MG20. To explore causes other than photoassimilate production, the possibility that local control by the root genotype occurred was investigated by grafting experiments. The results showed that the shoot and not the root genotype is responsible for root nodule formation. To explore systemic control mechanisms exclusive of photoassimilation, we moved wild-type MG20 plants from white light to conditions that differed in their ratios of low or high red(R)/ far-red(FR) light. In low R/ FR light, the number of MG20 root nodules dramatically decreased compared to plants grown in high R/ FR even though photoassimilate content was higher for plants grown under low R/ FR. Also, the expression of jasmonic acid(JA)-responsive genes decreased in both low R/ FR light-grown wild-type and in white light-grown phyB mutant plants, and correlated with decreased JA-Ile content in the phyB mutant. Moreover, both infection thread formation and root nodule formation were positively influenced by JA treatment of wild-type plants grown in low

  • Research Products

    (6 results)

All 2011 Other

All Journal Article (2 results) Presentation (2 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Lotus japonicus nodulation is photomorphogenetically controlled by sensing the R/ FR ratio through JA signaling2011

    • Author(s)
      Akihiro Suzuki, Lalith Suriyagoda, Tamaki Shigeyama, Akiyoshi Tominaga, Masayo Sasaki, Yoshimi Hiratsuka, Aya Yoshinaga, Susumu Arima, Sakae Agarie, Tatsuya Sakai, Sayaka Inada, Yusuke Jikumaru, Yuji Kamiya, Toshiki Uchiumi, Mikiko Abe, Masatsugu Hashiguc
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: vol.108 Pages: 16837-16842

  • [Journal Article] Additional cause for reduced JA-Ile in the root of a Lotus japonicus phyB mutant

    • Author(s)
      Tamaki Shigeyama, Akiyoshi Tominaga, Susumu Arima, Tatsuya Sakai, Sayaka Inada, Yusuke Jikumaru, Yuji Kamiya, Toshiki Uchiumi, Mikiko Abe, Masatsugu Hashiguchi, Ryo Akashi, Ann M. Hirsch and Akihiro Suzuki
    • Journal Title

      Plant Signaling and Behavior

      Volume: (in press)

  • [Presentation] Lotus japonicus nodulates when it sees red2011

    • Author(s)
      Akihiro Suzuki, Lalith Suriyagoda, Tamaki Shigeyama, Akiyoshi Tominaga, Masayo Sasaki, Yoshimi Hiratsuka, Aya Yoshinaga, Susumu Arima, Sakae Agarie, Tatsuya Sakai, Sayaka Inada, Yusuke Jikumaru, Yuji Kamiya, Toshiki Uchiumi, Mikiko Abe, Masatsugu Hashiguc
    • Organizer
      第17回世界窒素固定会議
    • Place of Presentation
      フリーマントル(オーストラリア)
    • Year and Date
      20111127-1201
  • [Presentation] 根粒形成はJAシグナリングを介したR/ FR比受容反応である2011

    • Author(s)
      重山珠紀, Lalith Suriyagoda, 富永晃好, 佐々木雅代, 平塚芳美, 吉永綾, 有馬進, 東江栄, 酒井達也, 稲田さやか, 軸丸祐介, 神谷勇治, 内海俊樹, 阿部美紀子, 橋口正嗣, 明石良, 佐藤修正, 金子貴一, 田畑哲之, Ann M. Hirsch, 鈴木章弘
    • Organizer
      植物微生物研究会第21回研究交流会
    • Place of Presentation
      岡山市
    • Year and Date
      20110920-0922
  • [Book] 根粒菌および菌根菌共生.最近の分子遺伝学の進歩感染・根粒形成と植物ホルモン,「植物の生長調節」2011

    • Author(s)
      鈴木章弘, 廣田敦子, 林誠特集
    • Total Pages
      112-119
  • [Remarks]

    • URL

      http://extwww.cc.saga-u.ac.jp/~azuki/top.html

URL: 

Published: 2013-07-31  

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