Sorghum qTGW1a encodes a G-protein subunit and acts as a negative regulator of grain size

文献类型： 外文期刊

第一作者： Zou, Guihua

作者： Zou, Guihua;Zhai, Guowei;Li, Sujuan;Liu, Heqin;Tao, Yuezhi;Yan, Song;Zhou, Lengbo;Ding, Yanqing;Zhang, Liyi;Zhang, Zhipeng;Zou, Jianqiu;Chen, Junping;Xin, Zhanguo

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关键词： Cloning; fine mapping; grain size; overexpression; qTGW1a; sorghum

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2020 年 71 卷 18 期

页码：

收录情况： SCI

摘要： Grain size is a major determinant of grain yield in sorghum and other cereals. Over 100 quantitative trait loci (QTLs) of grain size have been identified in sorghum. However, no gene underlying any grain size QTL has been cloned. Here, we describe the fine mapping and cloning of one grain size QTL. From an F-8 recombinant inbred line population derived from a cross between inbred lines 654 and LTR108, we identified 44 grain size QTLs. One QTL, qTGW1a, was detected consistently on the long arm of chromosome 1 in the span of 4 years. Using the extreme recombinants from an F-2:3 fine-mapping population, qTGW1a was delimited within a similar to 33 kb region containing three predicted genes. One of them, SORBI_3001G341700, predicted to encode a G-protein gamma subunit and homologous to GS3 in rice, is likely to be the causative gene for qTGW1a. qTGW1a appears to act as a negative regulator of grain size in sorghum. The functional allele of the putatively causative gene of qTGW1a from inbred line 654 decreased grain size, plant height, and grain yield in transgenic rice. Identification of the gene underlying qTGW1a advances our understanding of the regulatory mechanisms of grain size in sorghum and provides a target to manipulate grain size through genome editing.

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