OsVIN2 encodes a vacuolar acid invertase that affects grain size by altering sugar metabolism in rice

文献类型： 外文期刊

第一作者： Xu, Xinyang

作者： Xu, Xinyang;Wang, Chunming;Zhang, Huan;Wang, Fan;Liu, Xi;Zheng, Tianhui;Cai, Maohong;Zeng, Zhaoqiong;Zhou, Liang;Tang, Weijie;Jiang, Ling;Chen, Saihua;Wan, Jianmin;Wang, Jiulin;Chen, Saihua;Ren, Yulong;Chen, Jun;Zhu, Shanshan;Guo, Xiuping;Wan, Jianmin

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关键词： Rice (Oryza sativa); Grain size; OsVIN2; Acid invertase; Sugar metabolism; Yield improvement

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： 2019 年 38 卷 10 期

页码：

收录情况： SCI

摘要： Key message OsVIN2, a vacuolar invertase, affects grain size and yield by altering sugar composition, transport, and starch accumulation in rice. Grain size, a major determinant of rice yield, is influenced by many developmental and environmental factors. Sugar metabolism plays vital roles in plant development. However, the way in which sugar metabolism affects rice grain size remains largely elusive. In this study, we characterized the small grain-size rice mutant sgs1. Histological analyses showed that reduced spikelet hull and endosperm size results from decreased cell size rather than cell number. Map-based cloning and complementation tests revealed that a DaiZ7 transposon insertion in a vacuolar invertase gene OsVIN2 is responsible for the mutant phenotype. Subcellular distribution and biochemical analysis indicated that OsVIN2 is located in the vacuolar lumen, and that its sucrose hydrolysis activity is maintained under acidic conditions. Furthermore, an altered sugar content with increased sucrose and decreased hexose levels, as well as changes in invertase and sucrose synthase activities, sugar transport gene expression, and starch constitution in sgs1 implies that OsVIN2 affects sucrose metabolism, including sugar composition, transport, and conversion from the source to the sink organs. Collectively, OsVIN2 is involved in sugar metabolism, and thus regulates grain size; our findings provide insights into grain development and also suggest a potential strategy to improve grain quality and yield in rice.

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