Phenotypic, genetic, and molecular function of msc-2, a genic male sterile mutant in pepper (Capsicum annuum L.).,Theoretical and Applied Genetics

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Phenotypic, genetic, and molecular function of msc-2, a genic male sterile mutant in pepper (Capsicum annuum L.).
Theoretical and Applied Genetics ( IF 5.4 ) Pub Date : 2019-12-20 , DOI: 10.1007/s00122-019-03510-1
Qing Cheng ₁ , Ting Li ₁ , Yixin Ai ₁ , Qiaohua Lu ₁ , Yihao Wang ₁ , Lang Wu ₁ , Jinqiu Liu ₁ , Liang Sun ₁ , Huolin Shen ₁

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Bulked segregant analysis and fine mapping delimited the pepper genic male sterile (msc-2) locus into a 336 kb region on chromosome 5. A strong candidate gene, Capana05g000766, a homolog of AtMS1, was indentified in this region. Genic male sterility (msc-2) is used to produce hybrid seeds in Northern China. However, no co-segregated markers have been reported or candidate genes controlling this trait have been cloned. Here, bulked segregant analysis and genotyping of an F2 population and a 18Q5431AB line were employed to fine map msc-2, which was delimited to a 336 kb region. In this region, Capana05g000766 was a homolog of AtMS1, which encodes a plant homeodomain finger involved in tapetum development. A "T" deletion in the Capana05g000766 locus leads to a premature stop codon, which may cause a loss-of-function mutation. Real-time PCR analysis revealed that Capana05g000766 was an anther-specific gene and down-regulation of the gene resulted in male sterility. Therefore, Capana05g000766 was identified as the strongest candidate gene for the msc-2 locus. Allelism tests showed that msc-1 and msc-2 were nonallelic, and bimolecular fluorescence complementation analysis indicated that the two genes did not interact directly with each other at the protein level. As msc-1 and msc-2 are homologs of AtDYT1 and AtMS1 in Arabidopsis, they may play similar roles in tapetum development in genic male sterile peppers, and Msc-1 might be up stream of Msc-2 in the regulation of other genes involved in tapetum development.

更新日期：2020-01-04

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