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Improving Rice Quality by Regulating the Heading Dates of Rice Varieties without Yield Penalties

文献类型： 外文期刊

作者： Liu, Jianguo 1 ; Yi, Qinqin 1 ; Dong, Guojun 1 ; Chen, Yuyu 1 ; Guo, Longbiao 1 ; Gao, Zhenyu 1 ; Zhu, Li 1 ; Ren, Deyong 1 ; Zhang, Qiang 1 ; Li, Qing 1 ; Li, Jingyong 3 ; Liu, Qiangming 3 ; Zhang, Guangheng 1 ; Qian, Qian 1 ; Shen, Lan 1 ;

作者机构： 1.Chinese Acad Agr Sci, China Natl Rice Res Inst, State Key Lab Rice Biol & Breeding, Hangzhou 311401, Peoples R China

2.Zhejiang Normal Univ, Coll Life Sci, Jinhua 321004, Peoples R China

3.Chongqing Acad Agr Sci, Chongqing 401329, Peoples R China

关键词： Rice (Oryza sativa L); flowering time; OsMADS50; rice quality; CRISPR/Cas9

期刊名称：PLANTS-BASEL （ 影响因子：4.0； 五年影响因子：4.4 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 16 期

页码：

收录情况： SCI

摘要： The heading date, a critical trait influencing the rice yield and quality, has always been a hot topic in breeding research. Appropriately delaying the flowering time of excellent northern rice varieties is of great significance for improving yields and enhancing regional adaptability during the process for introducing varieties from north to south. In this study, genes influencing the heading date were identified through genome-wide association studies (GWAS). Using KenDao 12 (K12), an excellent cultivar from northern China, as the material, the specific flowering activator, OsMADS50, was edited using the genome-editing method to regulate the heading date to adapt to the southern planting environment. The results indicated that the osmads50 mutant line of K12 flowered about a week later, with a slight increase in the yield and good adaptability in the southern region in China. Additionally, the expressions of key flowering regulatory genes, such as Hd1, Ghd7, Ehd1, Hd3a, and RFT1, were reduced in the mutant plants, corroborating the delayed flowering phenotype. Yield trait analysis revealed that the primary factor for improved yield was an increase in the number of effective tillers, although there is potential for further enhancements in the seed-setting rate and grain plumpness. Furthermore, there were significant increases in the length-to-width ratio of the rice grains, fat content, and seed transparency, all contributing to an overall improvement in the rice quality. In summary, this study successfully obtained a rice variety with a delayed growth period through OsMADS50 gene editing, effectively implementing the strategy for adapting northern rice varieties to southern climates. This achievement significantly supports efforts to enhance the rice yield and quality as well as to optimize production management practices.

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