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Group A PP2Cs evolved in land plants as key regulators of intrinsic desiccation tolerance

Author

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  • Kenji Komatsu

    (Tokyo University of Agriculture
    Present address: Department of Bioproduction Technology, Junior College of Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo 156-8502, Japan)

  • Norihiro Suzuki

    (Tokyo University of Agriculture)

  • Mayuri Kuwamura

    (Tokyo University of Agriculture)

  • Yuri Nishikawa

    (Tokyo University of Agriculture)

  • Mao Nakatani

    (Tokyo University of Agriculture)

  • Hitomi Ohtawa

    (Tokyo University of Agriculture)

  • Daisuke Takezawa

    (Graduate School of Science and Engineering and Institute for Environmental Science and Technology, Saitama University)

  • Motoaki Seki

    (RIKEN Center for Sustainable Resource Science)

  • Maho Tanaka

    (RIKEN Center for Sustainable Resource Science)

  • Teruaki Taji

    (Tokyo University of Agriculture)

  • Takahisa Hayashi

    (Tokyo University of Agriculture)

  • Yoichi Sakata

    (Tokyo University of Agriculture)

Abstract

Vegetative desiccation tolerance is common in bryophytes, although this character has been lost in most vascular plants. The moss Physcomitrella patens survives complete desiccation if treated with abscisic acid (ABA). Group A protein phosphatases type 2C (PP2C) are negative regulators of abscisic acid signalling. Here we show that the elimination of Group A PP2C is sufficient to ensure P. patens survival to full desiccation, without ABA treatment, although its growth is severely hindered. Microarray analysis shows that the Group A PP2C-regulated genes exclusively overlap with genes exhibiting a high level of ABA induction. Group A PP2C disruption weakly affects ABA-activated kinase activity, indicating Group A PP2C action downstream of these kinases in the moss. We propose that Group A PP2C emerged in land plants to repress desiccation tolerance mechanisms, possibly facilitating plants propagation on land, whereas ABA releases the intrinsic desiccation tolerance from Group A PP2C regulation.

Suggested Citation

  • Kenji Komatsu & Norihiro Suzuki & Mayuri Kuwamura & Yuri Nishikawa & Mao Nakatani & Hitomi Ohtawa & Daisuke Takezawa & Motoaki Seki & Maho Tanaka & Teruaki Taji & Takahisa Hayashi & Yoichi Sakata, 2013. "Group A PP2Cs evolved in land plants as key regulators of intrinsic desiccation tolerance," Nature Communications, Nature, vol. 4(1), pages 1-9, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3219
    DOI: 10.1038/ncomms3219
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