Identification and Gene Fine Mapping of the Bisexual Sterility Mutant Meiosis Abnormal Bisexual Sterility 1 in Rice
文献类型： 外文期刊
作者： Wan, Yingchun 1 ; Liu, Xiaoqing 2 ; Wang, Nan 2 ; Zeng, Zhengming 1 ; Jiang, Yudong 1 ;
作者机构： 1.Sichuan Acad Agr Sci, Genet & Breeding Minist Agr, Southwest Key Lab Rice Biol Rice & Sorghum, Deyang Branch,Luzhou Branch,Natl Rice Improvement, Deyang 618000, Peoples R China
2.Southwest Univ, Engn Res Ctr Southern Mt Agr, Rice Res Inst, Transgenic Plants & Safety Control Chongqing Munic, Chongqing 400716, Peoples R China
关键词：
rice (
期刊名称：CURRENT ISSUES IN MOLECULAR BIOLOGY （ 影响因子：3.0； 五年影响因子：3.2 ）
ISSN： 1467-3037
年卷期： 2024 年 46 卷 11 期
页码：
收录情况： SCI
摘要： Exploring the genes regulating rice fertility is of great value for studying the molecular mechanisms of rice reproductive development and production practices. In this study, we identified a sterile mutant from the mutant library induced by ethyl methanesulfonate (EMS), designated as meiosis abnormal bisexual sterility 1 (mabs1). The mabs1 mutant exhibits no phenotypic differences from the wild-type during the vegetative growth phase but shows complete sterility during the reproductive growth phase. Phenotypic observations revealed that both pollen and embryo sac fertility are lost in mabs1. Notably, in mabs1, the development of the anther inner and outer walls, tapetum degeneration, and callose synthesis and degradation all proceed normally, yet meiosis fails to form normal tetrads. Genetic analysis indicated that this mutant trait is controlled by a single recessive nuclear gene. By constructing a genetic segregation population, we successfully mapped the MABS1 gene to a 49 kb region between primer markers Y7 and Y9 on chromosome 1. Resequencing revealed a single-nucleotide substitution in the exon of the LOC_Os01g66170 gene, which resulted in a change from Valine to Isoleucine. Subsequent sequencing of this locus in both wild-type and mabs1 mutants confirmed this mutation. Therefore, we have identified the gene at LOC_Os01g66170 as a candidate for MABS1, a previously unreported novel gene involved in rice meiosis. Through RT-qPCR, we found that the expression levels of multiple meiosis-related genes were significantly changed in the mabs1 mutant. Therefore, we believe that MABS1 is also involved in the process of rice meiosis. This study lays the groundwork for a functional study of MABS1.
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