The RNA Editing Factor WSP1 Is Essential for Chloroplast Development in Rice

文献类型： 外文期刊

第一作者： Zhang, Zhiguo

作者： Zhang, Zhiguo;Cui, Xuean;Wang, Yanwei;Wu, Jinxia;Gu, Xiaofeng;Lu, Tiegang

作者机构：

关键词： rice;RNA editing;PEP complex and ribosome biosynthesis;chloroplast development

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2017 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Although the multiple organellar RNA editing factors (MORFs) in the plastids of Arabidopsis thaliana have been extensively studied, molecular details underlying how MORFs affect plant development in other species, particularly in rice, remain largely unknown. Here we describe the characterization of wsp1, a rice mutant with white-stripe leaves and panicles. Notably, wsp1 exhibited nearly white immature panicles at the heading stage. Transmission electron microscopy analysis and chlorophyll content measurement revealed a chloroplast developmental defect and reduced chlorophyll accumulation in wsp1. Positional cloning of WSP1 found a point mutation in Os04g51280, whose putative product shares high sequence similarity with MORF proteins. Complementation experiments demonstrated that WSP1 was responsible for the variegated phenotypes of wsp1. WSP1 is localized to chloroplasts and the point mutation in wsp1 affected the editing of multiple organellar RNA sites. Owing to the defect in plastid RNA editing, chloroplast ribosome biogenesis and ndhA splicing were also impaired in wsp1, which may affect normal chloroplast development in the leaves and panicles at the heading stage. Together, our results demonstrate the importance of rice WSP1 protein in chloroplast development and broaden our knowledge about MORF family members in rice.

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