MSH7 confers quantitative variation in pollen fertility and boosts grain yield in maize

文献类型： 外文期刊

第一作者： Jiang, Luguang

作者： Jiang, Luguang;Jiang, Huan;Luo, Jinhong;He, Yan;Guo, Ting;Luo, Jinhong;He, Yan;Song, Xinyuan;Lu, Minhui;Rossi, Vincenzo

作者机构：

关键词： maize; pollen fertility; natural variation; GEN1; MSH7

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）

ISSN： 1467-7644

年卷期： 2024 年 22 卷 5 期

页码：

收录情况： SCI

摘要： Fertile pollen is critical for the survival, fitness, and dispersal of flowering plants, and directly contributes to crop productivity. Extensive mutational screening studies have been carried out to dissect the genetic regulatory network determining pollen fertility, but we still lack fundamental knowledge about whether and how pollen fertility is controlled in natural populations. We used a genome-wide association study (GWAS) to show that ZmGEN1A and ZmMSH7, two DNA repair-related genes, confer natural variation in maize pollen fertility. Mutants defective in these genes exhibited abnormalities in meiotic or post-meiotic DNA repair, leading to reduced pollen fertility. More importantly, ZmMSH7 showed evidence of selection during maize domestication, and its disruption resulted in a substantial increase in grain yield for both inbred and hybrid. Overall, our study describes the first systematic examination of natural genetic effects on pollen fertility in plants, providing valuable genetic resources for optimizing male fertility. In addition, we find that ZmMSH7 represents a candidate for improvement of grain yield.

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