The Hairless Stem Phenotype of Cotton (Gossypium barbadense) Is Linked to a Copia-Like Retrotransposon Insertion in a Homeodomain-Leucine Zipper Gene (HD1)

文献类型： 外文期刊

第一作者： Mingquan Ding;;Wuwei Ye

作者： Mingquan Ding;Wuwei Ye;Lifeng Lin;Shae He;Xiongming Du;Aiqun Chen;Yuefen Cao;Yuan Qin;Fen Yang;Yurong Jiang;Hua Zhang;Xiyin Wang;Andrew H. Paterson;Junkang Rong

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关键词： Gossypium barbadense;glabrous stem;homeodomain-leucine zipper gene (HD1);T1 locus;Ty1 retrotransposon element

期刊名称：GENETICS （ 影响因子：4.562； 五年影响因子：4.845 ）

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收录情况： SCI

摘要： Cotton (Gossypium) stem trichomes are mostly single cells that arise from stem epidermal cells. In this study, a homeodomain-leucine zipper gene (HD1) was found to cosegregate with the dominant trichome locus previously designated as T1 and mapped to chromosome 6. Characterization of HD1 orthologs revealed that the absence of stem trichomes in modern Gossypium barbadense varieties is linked to a large retrotransposon insertion in the ninth exon, 2565 bp downstream from the initial codon in the At subgenome HD1 gene (At-GbHD1). In both the At and Dt subgenomes, reduced transcription of GbHD1 genes is caused by this insertion. The disruption of At-HD1 further affects the expression of downstream GbMYB25 and GbHOX3 genes. Analyses of primitive cultivated accessions identified another retrotransposon insertion event in the sixth exon of At-GbHD1 that might predate the previously identified retrotransposon in modern varieties. Although both retrotransposon insertions results in similar phenotypic changes, the timing of these two retrotransposon insertion events fits well with our current understanding of the history of cotton speciation and dispersal. Taken together, the results of genetics mapping, gene expression and association analyses suggest that GbHD1 is an important component that controls stem trichome development and is a promising candidate gene for the T1 locus. The interspecific phenotypic difference in stem trichome traits also may be attributable to HD1 inactivation associated with retrotransposon insertion.

分类号： R394

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