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

第一作者： Lei, Bin

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

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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

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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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