OsSPL9 Regulates Grain Number and Grain Yield in Rice

文献类型： 外文期刊

第一作者： Hu, Li

作者： Hu, Li;Chen, Weilan;Yang, Wen;Li, Xiaoling;Zhang, Xiaoyu;Zheng, Ling;Qin, Peng;Wang, Yuping;Ma, Bingtian;Li, Shigui;Tu, Bin;Hu, Li;Zhang, Cheng;Zhu, Xiaobo;Yin, Junjie;Yuan, Hua

作者机构：

关键词： rice; panicle branches; grain number per panicle; grain yield; OsSPL9

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.754； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2021 年 12 卷

页码：

收录情况： SCI

摘要： Rice grain yield consists of several key components, including tiller number, grain number per panicle (GNP), and grain weight. Among them, GNP is mainly determined by panicle branches and spikelet formation. In this study, we identified a gene affecting GNP and grain yield, OsSPL9, which encodes SQUAMOSA-PROMOTER BINDING PROTEIN-LIKE (SPL) family proteins. The mutation of OsSPL9 significantly reduced secondary branches and GNP. OsSPL9 was highly expressed in the early developing young panicles, consistent with its function of regulating panicle development. By combining expression analysis and dual-luciferase assays, we further confirmed that OsSPL9 directly activates the expression of RCN1 (rice TERMINAL FLOWER 1/CENTRORADIALIS homolog) in the early developing young panicle to regulate the panicle branches and GNP. Haplotype analysis showed that Hap3 and Hap4 of OsSPL9 might be favorable haplotypes contributing to high GNP in rice. These results provide new insights on high grain number breeding in rice.

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