摘要： MYB转录因子蛋白普遍存在于植物中，在生物和非生物胁迫中发挥着重要作用。为了探讨棉花MYB转录因子的功能，采用同源克隆技术，在棉花叶片组织中克隆GhMYBPA1基因，并对其进行生物信息学和不同逆境胁迫下的表达分析。结果表明，从中棉35中成功克隆得到1个新的MYB转录因子基因GhMYBPA1（基因登录位点为XM_016869420），cDNA全长为825 bp，开放阅读框630 bp，编码210个氨基酸；生物信息学分析结果表明，GhMYBPA1蛋白分子质量为20.183 ku，N端含有2个MYB的DNA保守结合域，属于R2R3-MYB型转录因子；氨基酸同源分析发现，GhMYBPA1蛋白与来自亚洲棉GaMYB12-like同源性较高；qRT-PCR分析结果表明，GhMYBPA1在棉花根、茎、叶、花中均有表达，花中相对表达量最高，其次是叶；逆境胁迫分析表明，在受到高盐、低温和干旱处理诱导时，GhMYBPA1基因的表达量均发生了变化，推测GhMYBPA1可能在棉花非生物胁迫过程中起重要的调控作用。研究结果可为进一步开展GhMYBPA1基因功能研究奠定理论基础。

关键词: 棉花, GhMYBPA1, 生物信息学分析, 转录因子, 非生物逆境胁迫, 功能分析

Abstract: MYB transcription factor proteins are ubiquitous in plants and play an important role in biological and abiotic stresses. To explore the function of cotton MYB gene, the paper cloned a MYB gene from cotton leaves using homologous cloning technology, and analyzed its bioinformatics and expression under different stresses. The results showed that a new MYB transcription factor gene GhMYBPA1 (gene entry site XM_016869420) was successfully cloned from Gossypium hirsutum cv. Zhongmian 35, the full of cDNA was 825 bp in length with a 630 bp ORF, which encoded a 210 amino acids peptide. Bioinformatics analysis results showed that the molecular weight of GhMYBPA1 was 20.183 ku, GhMYBPA1 contained two conserved DNA-binding domains at N-terminal, which belonged to R2R3-MYB transcription factors. Amino acid homology analysis showed that GhMYBPA1 had higher identification with GaMYB12-like from Gossypium arboreum. Based on qRT-PCR analysis, GhMYBPA1 was constitutively expressed in cotton roots, stems, leaves, and it was dominantly expressed in flowers and then was leaves. Moreover, the results of plant treated with various stresses showed that the expression of GhMYBPA1 gene changed under high salt, low temperature and drought stress, it was suggested that GhMYBPA1 might play an important regulatory role in the abiotic stress process of cotton. The results could lay a theoretical foundation for further researches on the function of GhMYBPA1 gene.

Key words: Gossypium arboreum, GhMYBPA1, Bioinformatics analysis, Transcription factor, Abiotic stress, Functional analysis

中图分类号: 

• Q78

• S562.03