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Genome-wide analysis of the WRKY gene family in cotton
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  • 作者:Lingling Dou (1) (2)
    Xiaohong Zhang (1) (2)
    Chaoyou Pang (2)
    Meizhen Song (2)
    Hengling Wei (2)
    Shuli Fan (2)
    Shuxun Yu (1) (2)
  • 关键词:WRKY transcription factor ; Cotton ; Expression profile ; Development
  • 刊名:Molecular Genetics and Genomics
  • 出版年:2014
  • 出版时间:December 2014
  • 年:2014
  • 卷:289
  • 期:6
  • 页码:1103-1121
  • 全文大小:2,875 KB
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  • 作者单位:Lingling Dou (1) (2)
    Xiaohong Zhang (1) (2)
    Chaoyou Pang (2)
    Meizhen Song (2)
    Hengling Wei (2)
    Shuli Fan (2)
    Shuxun Yu (1) (2)

    1. College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, People鈥檚 Republic of China
    2. State Key Laboratory in Cotton Biology, Cotton Research Institute, P. R. Chinese Academy of Agriculture Sciences (CAAS), Anyang, 455000, Henan, People鈥檚 Republic of China
  • ISSN:1617-4623
文摘
WRKY proteins are major transcription factors involved in regulating plant growth and development. Although many studies have focused on the functional identification of WRKY genes, our knowledge concerning many areas of WRKY gene biology is limited. For example, in cotton, the phylogenetic characteristics, global expression patterns, molecular mechanisms regulating expression, and target genes/pathways of WRKY genes are poorly characterized. Therefore, in this study, we present a genome-wide analysis of the WRKY gene family in cotton (Gossypium raimondii and Gossypium hirsutum). We identified 116 WRKY genes in G. raimondii from the completed genome sequence, and we cloned 102 WRKY genes in G. hirsutum. Chromosomal location analysis indicated that WRKY genes in G. raimondii evolved mainly from segmental duplication followed by tandem amplifications. Phylogenetic analysis of alga, bryophyte, lycophyta, monocot and eudicot WRKY domains revealed family member expansion with increasing complexity of the plant body. Microarray, expression profiling and qRT-PCR data revealed that WRKY genes in G. hirsutum may regulate the development of fibers, anthers, tissues (roots, stems, leaves and embryos), and are involved in the response to stresses. Expression analysis showed that most group II and III GhWRKY genes are highly expressed under diverse stresses. Group I members, representing the ancestral form, seem to be insensitive to abiotic stress, with low expression divergence. Our results indicate that cotton WRKY genes might have evolved by adaptive duplication, leading to sensitivity to diverse stresses. This study provides fundamental information to inform further analysis and understanding of WRKY gene functions in cotton species.

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