数字农科院2.0

Genome-wide association study uncovers a novel gene responsible for rice seedling submergence tolerance

文献类型： 外文期刊

作者： Lu, Xueli;Yang, Long;Shen, Lan;Zhan, Chengfang;Dai, Liping;Huang, Linzhou;Zhang, Qiang;Fang, Yunxia;Ren, Deyong;Zhu, Li;Hu, Jiang;Gao, Zhenyu;Zhang, Guangheng;Lin, Yongjun;Zeng, Dali;Xue, Dawei;Qian, Qian;Li, Qing

作者机构：

关键词： rice;submergence tolerance;qSHS5;ROS;natural variation;breeding improvement

期刊名称： PLANT BIOTECHNOLOGY JOURNAL

ISSN： 1467-7644

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Submergence tolerance is crucial for the direct seeding of rice, yet long-term domestication and breeding have inadvertently reduced the adaptability of cultivated rice to submergence stress. Here, we identify a nucleic acid excision repair protein-encoding gene qSHS5 as an essential regulator of seedling height under submergence through a genome-wide association study in 322 rice accessions. Disruption of qSHS5 in mutants resulted in seedling growth inhibition under submergence, while growth remains comparable to wild-type under normal conditions. This inhibition is primarily due to decreased cell number resulting from G1 phase cell cycle arrest. Further investigation showed that levels of reactive oxygen species (ROS), O2- and H2O2 significantly increased, and DNA damage was aggravated in qshs5 mutants under submergence. Additionally, we find the submergence-tolerant haplotype qSHS5H4 has been progressively lost, while the elite haplotype qSHS5H3 has been largely overlooked during the breeding of semi-dwarf and high-yield in rice. Importantly, we demonstrate that combining qSHS5H3 with the semi-dwarfing haplotype SD1H1 exhibited high yield without compromising submergence tolerance, offering significant potential for future breeding programmes targeting direct seeding cultivation. This study not only identifies a novel superior allele but also provides valuable insights for future improvement of rice cultivation, particularly under climate change-induced submergence for direct seeding.

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