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Shoot-derived cytokinins systemically regulate root nodulation

Author

Listed:
  • Takema Sasaki

    (National Institute for Basic Biology
    Department of Basic Biology in the School of Life Science of the Graduate University for Advanced Studies)

  • Takuya Suzaki

    (National Institute for Basic Biology
    Department of Basic Biology in the School of Life Science of the Graduate University for Advanced Studies)

  • Takashi Soyano

    (National Institute for Basic Biology)

  • Mikiko Kojima

    (Plant Productivity Systems Research Group, RIKEN Center for Sustainable Resource Science)

  • Hitoshi Sakakibara

    (Plant Productivity Systems Research Group, RIKEN Center for Sustainable Resource Science)

  • Masayoshi Kawaguchi

    (National Institute for Basic Biology
    Department of Basic Biology in the School of Life Science of the Graduate University for Advanced Studies)

Abstract

Legumes establish symbiotic associations with nitrogen-fixing bacteria (rhizobia) in root nodules to obtain nitrogen. Legumes control nodule number through long-distance communication between roots and shoots, maintaining the proper symbiotic balance. Rhizobial infection triggers the production of mobile CLE-RS1/2 peptides in Lotus japonicus roots; the perception of the signal by receptor kinase HAR1 in shoots presumably induces the production of an unidentified shoot-derived inhibitor (SDI) that translocates to roots and blocks further nodule development. Here we show that, CLE-RS1/2-HAR1 signalling activates the production of shoot-derived cytokinins, which have an SDI-like capacity to systemically suppress nodulation. In addition, we show that LjIPT3 is involved in nodulation-related cytokinin production in shoots. The expression of LjIPT3 is activated in an HAR1-dependent manner. We further demonstrate shoot-to-root long-distance transport of cytokinin in L. japonicus seedlings. These findings add essential components to our understanding of how legumes control nodulation to balance nutritional requirements and energy status.

Suggested Citation

  • Takema Sasaki & Takuya Suzaki & Takashi Soyano & Mikiko Kojima & Hitoshi Sakakibara & Masayoshi Kawaguchi, 2014. "Shoot-derived cytokinins systemically regulate root nodulation," Nature Communications, Nature, vol. 5(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5983
    DOI: 10.1038/ncomms5983
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    Cited by:

    1. Jieshun Lin & Yuda Purwana Roswanjaya & Wouter Kohlen & Jens Stougaard & Dugald Reid, 2021. "Nitrate restricts nodule organogenesis through inhibition of cytokinin biosynthesis in Lotus japonicus," Nature Communications, Nature, vol. 12(1), pages 1-12, December.
    2. Giuseppe Malgioglio & Giulio Flavio Rizzo & Sebastian Nigro & Vincent Lefebvre du Prey & Joelle Herforth-Rahmé & Vittoria Catara & Ferdinando Branca, 2022. "Plant-Microbe Interaction in Sustainable Agriculture: The Factors That May Influence the Efficacy of PGPM Application," Sustainability, MDPI, vol. 14(4), pages 1-28, February.
    3. Anna Kokla & Martina Leso & Xiang Zhang & Jan Simura & Phanu T. Serivichyaswat & Songkui Cui & Karin Ljung & Satoko Yoshida & Charles W. Melnyk, 2022. "Nitrogen represses haustoria formation through abscisic acid in the parasitic plant Phtheirospermum japonicum," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    4. Jiahuan Chen & Zhijuan Wang & Lixiang Wang & Yangyang Hu & Qiqi Yan & Jingjing Lu & Ziyin Ren & Yujie Hong & Hongtao Ji & Hui Wang & Xinying Wu & Yanru Lin & Chao Su & Thomas Ott & Xia Li, 2022. "The B-type response regulator GmRR11d mediates systemic inhibition of symbiotic nodulation," Nature Communications, Nature, vol. 13(1), pages 1-17, December.

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