The putative auxin efflux carrier OsPIN3t is involved in the drought stress response and drought tolerance

文献类型： 外文期刊

第一作者： Zhang, Qian

作者： Zhang, Qian;Li, Jingjing;Zhang, Wenjiao;Yan, Shuning;Wang, Rui;Zhao, Junfeng;Li, Yujing;Qi, Zhiguang;Zhu, Zhengge;Sun, Zongxiu;Zhu, Zhengge

作者机构：

关键词： OsPIN3t;auxin efflux carrier;drought stress;crown root;Oryza sativa

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

年卷期： 2012 年 72 卷 5 期

页码：

收录情况： SCI

摘要： The phytohormone auxin plays a critical role in plant growth and development, and its spatial distribution largely depends on the polar localization of the PIN-FORMED (PIN) auxin efflux carrier family members. In this study, we identify a putative auxin efflux carrier gene in rice, OsPIN3t, which acts in auxin polar transport but is also involved in the drought stress response in rice. We show that OsPIN3tGFP fusion proteins are localized in plasma membranes, and this subcellular localization changes under 1-N-naphthylphthalamic acid (NPA) treatment. The tissue-specific expression patterns of OsPIN3t were also investigated using a beta-glucuronidase (GUS) reporter, which showed that OsPIN3t was mainly expressed in vascular tissue. The GUS activity in OsPIN3tpro::GUS plants increased by NAA treatment and decreased by NPA treatment. Moreover, knockdown of OsPIN3t caused crown root abnormalities in the seedling stage that could be phenocopied by treatment of wild-type plants with NPA, which indicated that OsPIN3t is involved in the control of polar auxin transport. Overexpression of OsPIN3t led to improved drought tolerance, and GUS activity significantly increased when OsPIN3tpro::GUS plants were subjected to 20% polyethylene glycol stress. Taken together, these results suggest that OsPIN3t is involved in auxin transport and the drought stress response, which suggests that a polar auxin transport pathway is involved in the regulation of the response to water stress in plants.

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