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Genetic analysis and fine mapping of a grain size QTL in the smallgrain sterile rice line Zhuo201S

文献类型： 外文期刊

作者： Lei, Bin 1 ; Shao, Jiale 2 ; Zhang, Feng 2 ; Wang, Jian 2 ; Xiao, Yunhua 1 ; Cheng, Zhijun 2 ; Tang, Wenbang 1 ; Wan, Jianmin 2 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Changsha 410128, Peoples R China

2.Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improve, Beijing 100081, Peoples R China

3.Nanjing Agr Univ, Jiangsu Plant Gene Engn Res Ctr, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China

4.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China

关键词： rice; grain size; map-based cloning

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.6； 五年影响因子：4.5 ）

ISSN： 2095-3119

年卷期： 2024 年 23 卷 7 期

页码：

收录情况： SCI

摘要： The development and application of the small-grain rice sterile line Zhuo201S (Z201S) has demonstrated its potential for mechanized hybrid rice seed production, leading to significant cost reductions. However, the molecular mechanism responsible for the small-grain size characteristic of Z201S remains unclear. In this study, we conducted a genetic analysis using near-isogenic lines constructed from Z210S, a small-grain rice sterile line, and R2115, a normal-grain variety. The results revealed that the small-grain trait in Z201S is governed by a single partially dominant gene which also enhances grain number. Through mapping, we localized the causal gene to the short arm of chromosome 2, within a 113 kb physical region delimited by the molecular markers S2-4-1 and LB63. Transgenic analysis and gene expression assays indicated LOC_Os02g14760 as the most likely candidate gene, suggesting that the small-grain size trait of Z201S is controlled by a novel locus that has not been previously identified.

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