文献类型： 外文期刊

作者： Liu, Song ¹ ; Wu, Jiamin ¹ ; Mawia, Amos Musyoki ¹ ; Wei, Xiangjin ¹ ; Cao, Ruijie ¹ ; Jiao, Guiai ¹ ; Wu, Yawen ¹ ; Zhang, Jian ¹ ; Xie, Lihong ¹ ; Sheng, Zhonghua ¹ ; Hu, Shikai ¹ ; Li, Sanfeng ¹ ; Lv, Yusong ¹ ; Lu, Feifei ¹ ; Chen, Yujuan ¹ ; Fiaz, Sajid ¹ ; Tabassum, Javaria ¹ ; Du, Zhimin ¹ ; Gao, Fangyuan ² ; Ren, Guangjun ² ; Shao, Gaoneng ¹ ; Hu, Peisong ¹ ; Tang, Shaoqing ¹ ;

作者机构： 1.Chinese Acad Agr Sci, China Natl Rice Res Inst, China Natl Ctr Rice Improvement, China IRRI Joint Res Ctr Rice Qual & Nutr,State Ke, Hangzhou, Peoples R China

2.Sichuan Acad Agr Sci, Minist Agr & Rural Affairs, Crop Res Inst, Coconstruct Minist & Prov,Sichuan Prov Germplasm C, Chengdu, Peoples R China

3.Univ Lahore, Inst Mol Biol & Biotechnol, Lahore, Pakistan

关键词： OsMYB73; endosperm starch and lipid biosynthesis; auxin biosynthesis; grain filling and endosperm development; grain size and chalkiness; yield and quality

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：10.5； 五年影响因子：12.4 ）

ISSN： 1467-7644

年卷期： 2025 年 23 卷 4 期

页码：

收录情况： SCI

摘要： Enhanced grain yield and quality traits are everlasting breeding goals. It is therefore of great significance to uncover more genetic resources associated with these two important agronomic traits. Plant MYB family transcription factors play important regulatory roles in diverse biological processes. However, studies on genetic functions of MYB in rice yield and quality are rarely to be reported. Here, we investigated a nucleus-localized transcription factor OsMYB73 which is preferentially expressed in the early developing pericarp and endosperm. We generated targeted mutagenesis of OsMYB73 in rice, and the mutants had longer grains with obvious white-belly chalky endosperm appearance phenotype. The mutants displayed various changes in starch physicochemical characteristics and lipid components. Transcriptome sequencing analysis showed that OsMYB73 was chiefly involved in cell wall development and starch metabolism. OsMYB73 mutation affects the expression of genes related to grain size, starch and lipid biosynthesis and auxin biosynthesis. Moreover, inactivation of OsMYB73 triggers broad changes in secondary metabolites. We speculate that rice OsMYB73 and OsNF-YB1 play synergistic pivotal role in simultaneously as transcription activators to regulate grain filling and storage compounds accumulation to affect endosperm development and grain chalkiness through binding OsISA2, OsLTPL36 and OsYUC11. The study provides important germplasm resources and theoretical basis for genetic improvement of rice yield and quality. In addition, we enriches the potential biological functions of rice MYB family transcription factors.