Phosphatidylserine Synthase Controls Cell Elongation Especially in the Uppermost Internode in Rice by Regulation of Exocytosis

文献类型： 外文期刊

第一作者： Ma, Jin

作者： Ma, Jin;Cheng, Zhijun;Chen, Jun;Ren, Yulong;Wang, Jiu-Lin;Lei, Cailin;Zhang, Xin;Guo, Xiuping;Wan, Jian-Min;Shen, Jinbo;Ding, Yu;Zhang, Baocai;Zhou, Yihua;Zhang, Baocai;Zhou, Yihua;Zhang, Huan;Zhou, Kunneng;Gao, He;Bao, Yiqun;Wan, Jian-Min

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2016 年 11 卷 4 期

页码：

收录情况： SCI

摘要： The uppermost internode is one of the fastest elongating organs in rice, and is expected to require an adequate supply of cell-wall materials and enzymes to the cell surface to enhance mechanical strength. Although it has been reported that the phenotype of shortened uppermost internode 1 (sui1) is caused by mutations in PHOSPHATIDYLSERINE SYNTHASE (OsPSS), the underlying mechanism remains unclear. Here we show that the OsPSS-1, as a gene expressed predominantly in elongating cells, regulates post-Golgi vesicle secretion to intercellular spaces. Mutation of OsPSS-1 leads to compromised delivery of CESA4 and secGFP towards the cell surface, resulting in weakened intercellular adhesion and disorganized cell arrangement in parenchyma. The phenotype of sui1-4 is caused largely by the reduction in cellulose contents in the whole plant and detrimental delivery of pectins in the uppermost internode. We found that OsPSS-1 and its potential product PS (phosphatidylserine) localized to organelles associated with exocytosis. These results together suggest that OsPSS-1 plays a potential role in mediating cell expansion by regulating secretion of cell wall components.

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