OsSPL9 Regulates Grain Number and Grain Yield in Rice.
OsSPL9 Regulates Grain Number and Grain Yield in Rice.
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DOI：
10.3389/fpls.2021.682018
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发表时间：
2021
影响因子：
5.6
通讯作者：
Tu B
中科院分区：
文献类型：
--
作者：
Hu L;Chen W;Yang W;Li X;Zhang C;Zhang X;Zheng L;Zhu X;Yin J;Qin P;Wang Y;Ma B;Li S;Yuan H;Tu B
水稻产量由几个关键因素组成，包括分蘖数、每穗粒数和粒重。其中，GNP主要由穗部分枝和小穗形成决定。在本研究中，我们克隆了一个影响GNP和粮食产量的基因OsSPL9，该基因编码鳞状启动子结合蛋白(SPL)家族蛋白。OsSPL9基因突变显著降低了二次分枝数和GNP。OsSPL9在幼穗发育早期高表达，与其调控穗部发育的功能一致。通过结合表达分析和双荧光素酶分析，我们进一步证实OsSPL9直接激活RCN1(水稻末端花1/中心花同源)在幼穗发育早期的表达，从而调节穗分枝和GNP。单倍型分析表明，OsSPL9的Hap3和Hap4可能是导致水稻高GNP的有利单倍型。这些结果为水稻高粒数育种提供了新的思路。
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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