RSS1 regulates the cell cycle and maintains meristematic activity under stress conditions in rice

Daisuke Ogawa, Kiyomi Abe, Akio Miyao, Mikiko Kojima, Hitoshi Sakakibara, Megumi Mizutani, Haruka Morita, Yosuke Toda, Tokunori Hobo, Yutaka Sato, Tsukaho Hattori, Hirohiko Hirochika () and Shin Takeda ()
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Daisuke Ogawa: Bioscience and Biotechnology Center, Nagoya University, Chikusa
Kiyomi Abe: National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba
Akio Miyao: National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba
Mikiko Kojima: RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama
Hitoshi Sakakibara: RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama
Megumi Mizutani: Bioscience and Biotechnology Center, Nagoya University, Chikusa
Haruka Morita: Bioscience and Biotechnology Center, Nagoya University, Chikusa
Yosuke Toda: Bioscience and Biotechnology Center, Nagoya University, Chikusa
Tokunori Hobo: Bioscience and Biotechnology Center, Nagoya University, Chikusa
Yutaka Sato: Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa
Tsukaho Hattori: Bioscience and Biotechnology Center, Nagoya University, Chikusa
Hirohiko Hirochika: National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba
Shin Takeda: Bioscience and Biotechnology Center, Nagoya University, Chikusa

Nature Communications, 2011, vol. 2, issue 1, 1-11

Abstract: Abstract Plant growth and development are sustained by continuous cell division in the meristems, which is perturbed by various environmental stresses. For the maintenance of meristematic functions, it is essential that cell division be coordinated with cell differentiation. However, it is unknown how the proliferative activities of the meristems and the coordination between cell division and differentiation are maintained under stressful conditions. Here we show that a rice protein, RSS1, whose stability is controlled by cell cycle phases, contributes to the vigour of meristematic cells and viability under salinity conditions. These effects of RSS1 are exerted by regulating the G1–S transition, possibly through an interaction of RSS1 with protein phosphatase 1, and are mediated by the phytohormone, cytokinin. RSS1 is conserved widely in plant lineages, except eudicots, suggesting that RSS1-dependent mechanisms might have been adopted in specific lineages during the evolutionary radiation of angiosperms.

Date: 2011
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DOI: 10.1038/ncomms1279

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