Journal Article

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

Toda, Yosuke, Morita, Haruka, Takeda, Shin, Sato, Yutaka, Hattori, Tsukaho, Mizutani, Megumi, Abe, Kiyomi, Ogawa, Daisuke, Miyao, Akio, Sakakibara, Hitoshi, Hirochika, Hirohiko, Kojima, Mikiko, Hobo, Tokunori

2011

Overview

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. Cell proliferation in plant meristems is often altered during conditions of stress. In this study, the authors identify a plant protein, RSS1, that is regulated in a cell-cycle dependent manner and is required to maintain shoot and root meristems in the presence of abiotic stress.

• Publisher: Nature Publishing Group UK,Nature Publishing Group
• Subject: 631/449/1659 / 631/449/2661 / 631/449/448/1358 / Amino Acid Sequence / Cell cycle / Cell differentiation / Cell division / Cell growth / Cereals / Cloning, Molecular / Cytokinins - metabolism / DNA Primers - genetics / Environmental stress / Humanities and Social Sciences / Immunoblotting / In Situ Hybridization / Interphase - genetics / Interphase - physiology / Kinases / Meristem - physiology / Microarray Analysis / Microscopy, Fluorescence / Molecular Sequence Data / multidisciplinary / Oryza - genetics / Oryza - physiology / Phosphatase / Plant growth / Plant Proteins - genetics / Plant Proteins - metabolism / Plant Proteins - physiology / Protein Phosphatase 1 - metabolism / Proteins / Salinity / Salt / Science / Science (multidisciplinary) / Stress, Physiological - physiology / Two-Hybrid System Techniques