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Natural variation of WBR7 confers rice high yield and quality by modulating sucrose supply in sink organs

文献类型： 外文期刊

作者： Shi, Huan 1 ; Yun, Peng 2 ; Zhu, Yun 1 ; Wang, Lu 1 ; Wang, Yipei 1 ; Li, Pingbo 3 ; Zhou, Hao 4 ; Cheng, Shiyuan 1 ; Liu, Rongjia 1 ; Gao, Guanjun 1 ; Zhang, Qinglu 1 ; Xiao, Jinghua 1 ; Li, Yibo 1 ; Xiong, Lizhong 1 ; You, Aiqing 5 ; He, Yuqing 1 ;

作者机构： 1.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Hubei Hongshan Lab, Wuhan, Peoples R China

2.Anhui Acad Agr Sci, Rice Res Inst, Hefei, Peoples R China

3.Shandong Acad Agr Sci, Inst Wetland Agr & Ecol, Jinan, Peoples R China

4.Sichuan Agr Univ, Rice Res Inst, State Key Lab Crop Gene Explorat & Utilizat Southw, Chengdu, Peoples R China

5.Hubei Acad Agr Sci, Inst Food Crop, Wuhan, Peoples R China

关键词： rice; map-based cloning; white-belly rate; WBR7; sucrose synthase; quality and yield

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：10.1； 五年影响因子：11.6 ）

ISSN： 1467-7644

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Grain chalkiness is an undesirable trait that negatively regulates grain yield and quality in rice. However, the regulatory mechanism underlying chalkiness is complex and remains unclear. We identified a positive regulator of white-belly rate (WBR). The WBR7 gene encodes sucrose synthase 3 (SUS3). A weak functional allele of WBR7 is beneficial in increasing grain yield and quality. During the domestication of indica rice, a functional G/A variation in the coding region of WBR7 resulted in an E541K amino acid substitution in the GT-4 glycosyltransferase domain, leading to a significant decrease in decomposition activity of WBR7(A) (allele in cultivar Jin23B) compared with WBR7(G) (allele in cultivar Beilu130). The NIL(J23B) and knockout line NIL(BL130)(KO) exhibited lower WBR7 decomposition activity than that of NIL(BL130) and NIL(J23B)(COM), resulting in less sucrose decomposition and metabolism in the conducting organs. This caused more sucrose transportation to the endosperm, enhancing the synthesis of storage components in the endosperm and leading to decreased WBR. More sucrose was also transported to the anthers, providing sufficient substrate and energy supply for pollen maturation and germination, ultimately leading to an increase rate of seed setting and increased grain yield. Our findings elucidate a mechanism for enhancing rice yield and quality by modulating sucrose metabolism and allocation, and provides a valuable allele for improved rice quality.

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