OPEN GLUME1: a key enzyme reducing the precursor of JA, participates in carbohydrate transport of lodicules during anthesis in rice

文献类型： 外文期刊

第一作者： Li, Xiaohui

作者： Li, Xiaohui;Wang, Yihua;Duan, Erchao;Zhou, Kunneng;Lin, Qiuyun;Wang, Di;Wang, Yunlong;Long, Wuhua;Zhao, Zhigang;Jiang, Ling;Wang, Chunming;Wan, Jianmin;Cheng, Zhijun;Lei, Cailin;Zhang, Xin;Guo, Xiuping;Wang, Jiulin;Wu, Chuanyin;Wan, Jianmin;Qi, Qi

作者机构：

关键词： OPEN GLUME1;Lodicule;Jasmonic acid;Carbohydrate;Oryza sativa;Anthesis

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN： 0721-7714

年卷期： 2018 年 37 卷 2 期

页码：

收录情况： SCI

摘要： OG1 is involved in JA-regulated anthesis by modulating carbohydrate transport of lodicules in rice. Flowering plants have evolved a sophisticated regulatory network to coordinate anthesis and maximize reproductive success. In addition to various environmental conditions, the plant hormone jasmonic acid and its derivatives (JAs) are involved in anthesis. However, the underlying mechanism remains largely unexplored. Here, we report a JA-defective mutant in rice (Oryza sativa), namely open glume 1, which has dysfunctional lodicules that lead to open glumes following anthesis. Map-based cloning and subsequent complementation tests confirmed that OG1 encodes a peroxisome-localized 12-oxo-phytodienoic acid reductase-a key enzyme that reduces the precursor of JA. Loss-of-function of OG1 resulted in almost no JA accumulation. Exogenous JA treatment completely rescued the defects caused by the og1 mutation. Further studies revealed that intracellular metabolism was disrupted in the lodicules of og1 mutant. At the mature plant stage, most seeds of the mutant were malformed with significantly reduced starch content. We speculate that JA or JA signaling mediates the carbohydrate transport of lodicules during anthesis, and signal the onset of cell degradation in lodicules after anthesis. We conclude that the OPEN GLUME 1 gene that produces a key enzyme involved in reducing the precursor of JA in JA biosynthesis and is involved in carbohydrate transport underlying normal lodicule function during anthesis in rice.

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