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

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Daisuke Ogawa, Kiyomi Abe, Akio Miyao, Mikiko Kojima, Hitoshi Sakakibara, Megumi Mizutani, Haruka Morita, Yosuke Toda, Tokunori Hobo, Yutaka Sato, Tsukaho Hattori, Hirohiko Hirochika, Shin Takeda
Nature Communications, 2011, 2 : 278  DOI: 10.1038/ncomms1279;      追溯原文......本站官方QQ群:62473826

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.

逆境条件下RSS1调节水稻细胞周期并维持分生组织的活性

植物的生长和发育需要分生组织持续进行细胞分裂来维持,这一过程经常受到各种环境逆境的影响。细胞分裂和细胞分化对分生功能的维持是非常重要的。然而目前对逆境条件下,分生组织是如何维持增殖活性、协调细胞分裂和分化的,还所知甚少。本研究发现一个水稻蛋白RSS1对盐胁迫条件下分生细胞活性和活力的维持发挥作用,RSS1的稳定性受到细胞周期阶段的调控。RSS1可能是通过由细胞分裂素介导的、RSS1与蛋白磷酸化酶1(PP1)的互作,调节G1-S期的转换。除双子叶植物外,RSS1在植物中是非常保守的,表明依赖RSS1的调节机制在被子植物辐射演化过程中,为某些特定的支系所采用。


基因列表
  盐敏感 RSS1