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The comparison of four mitochondrial genomes reveals cytoplasmic male sterility candidate genes in cotton

文献类型： 外文期刊

作者： Li, Shuangshuang 1 ; Chen, Zhiwen 1 ; Zhao, Nan 1 ; Wang, Yumei 2 ; Nie, Hushuai 1 ; Hua, Jinping 1 ;

作者机构： 1.China Agr Univ, Key Lab Crop Heterosis & Utilizat, Coll Agron & Biotechnol,Minist Educ, Lab Cotton Genet Genom & Breeding,Beijing Key Lab, Beijing 100193, Peoples R China

2.Hubei Acad Agr Sci, Inst Cash Crops, Wuhan 430064, Hubei, Peoples R China

关键词： Mitochondrial genomes; Cytoplasmic male sterility; Chimeric ORFs; Comparative genomics; Transcriptomes; Gossypium

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2018 年 19 卷

页码：

收录情况： SCI

摘要： Background: The mitochondrial genomes of higher plants vary remarkably in size, structure and sequence content, as demonstrated by the accumulation and activity of repetitive DNA sequences. Incompatibility between mitochondrial genome and nuclear genome leads to non-functional male reproductive organs and results in cytoplasmic male sterility (CMS). CMS has been used to produce F-1 hybrid seeds in a variety of plant species. Results: Here we compared the mitochondrial genomes (mitogenomes) of Gossypium hirsutum sterile male lines CMS-2074A and CMS-2074S, as well as their restorer and maintainer lines. First, we noticed the mitogenome organization and sequences were conserved in these lines. Second, we discovered the mitogenomes of 2074A and 2074S underwent large-scale substitutions and rearrangements. Actually, there were five and six unique chimeric open reading frames (ORFs) in 2074A and 2074S, respectively, which were derived from the recombination between unique repetitive sequences and nearby functional genes. Third, we found out four chimeric ORFs that were differentially transcribed in sterile line (2074A) and fertile-restored line. Conclusions: These four novel and recombinant ORFs are potential candidates that confer CMS character in 2074A. In addition, our observations suggest that CMS in cotton is associated with the accelerated rates of rearrangement, and that novel expression products are derived from recombinant ORFs.

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