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    普通烟草DREB转录因子的序列鉴定与表达分析

    Genome-wide Sequence Identification and Expression Analysis of DREB Transcription Factors in Nicotiana tabacum

    • 摘要: DREB转录因子含有一个保守的AP2/ERF结构域,在植物抗逆过程中起关键作用。利用生物信息学分析手段,以拟南芥DREB家族成员序列为参照,在普通烟草(Nicotiana tabacum)基因组公共数据库中鉴定出了68个DREB转录因子。对烟草DREB转录因子家族进行了理化性质、系统进化、保守结构域和表达分析。结果表明,普通烟草基因组编码68个DREB转录因子家族成员,氨基酸数目差异较大;系统发育分析表明,拟南芥和烟草的DREB转录因子共125个成员形成6个进化分支,其中烟草比拟南芥缺少A6分支;结构域分析表明,同一分支内的DREB转录因子的保守结构域以及motif具有高度的一致性;组织表达分析表明,大多数DREB家族基因在烟草中表达量较低,在衰老、干旱和病害胁迫下基因表达量较多。此研究将为烟草DREB转录因子的深入分析奠定了生物信息学基础。

       

      Abstract: DREB transcription factors, with a typical AP2/ERF DNA-binding domain, play a key role in plants' tolerance to environmental stresses. In this study, based on the common tobacco genome database, 68 members of the tobacco DREB gene family were identified according to Arabidopsis thaliana protein sequences. The analyses of physical and chemical properties, phylogenetic tree, gene structures, and tissue expression patterns were performed. The results suggested that the peptide length of different subfamily members was significantly different. Phylogenetic analysis revealed that the tobacco DREB transcription factor family members could be divided into 5 subfamilies, lacking the A6 group from Arabidopsis thaliana. The patterns of protein structures and organization of conserved domains in tobacco were highly conserved within subfamilies based on the phylogenetic results. Transcriptome analysis showed that the expression patterns of DREBs were different in different tissue types and most DREBs have low expression levels in tobacco, although some have higher expression levels after environmental stress treatments. These results provide a very useful reference for cloning and functional analysis of DREB genes in tobacco.

       

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