玉米WRKY 转录因子非生物胁迫的表达分析

    Expression analysis of maize WRKY transcription factor genes under abiotic stress

    • 摘要: WRKY 蛋白是一类植物特异的转录因子家族,在植物响应病害及非生物胁迫中起重要作用。通过生物信息学方法,从玉米基因组中得到3 个WRKY 家族基因序列(ZmWRKY14-like、ZmWRKY25-like、ZmWRKY62-like),预测表明3 个蛋白都定位于细胞核。荧光定量PCR 分析表明,3 个基因在玉米的不同器官中都有表达,但具有组织表达特异性。ZmWRKY14-like 和ZmWRKY62-like 在幼果中的表达量均显著高于在其他组织中的表达量,ZmWRKY25-like 基因在叶、穗丝和幼果中的表达量高于在其他组织中的表达量。盐胁迫下,ZmWRKY25-like 基因呈上调表达,ZmWRKY62-like 基因呈下调表达;干旱胁迫下,ZmWRKY62-like 基因出现下调表达;低温胁迫下,ZmWRKY25-like 基因呈上调表达。结果表明,ZmWRKY25-like 可能参与了植物对盐和低温胁迫的响应,ZmWRKY62-like 基因则可能参与了植物对盐和干旱胁迫的响应。

       

      Abstract: WRKY proteins are large family of plant-specific transcription factors( TFs),play essential roles in regulating plant responses to pathogens and abiotic stress. In this study,we identified three WRKY transcription factor( TF) genes( ZmWRKY14-like,ZmWRKY25-like,ZmWRKY62-like) in maize by using bioinformatics method. Plant-mPLoc predicted that these three proteins were all localized in nucleus. Real-time qPCR assay showed that ZmWRKY14-like,ZmWRKY25-like,ZmWRKY62-like expressed in all tested maize tissues,but had differential expression. The expression levels of ZmWRKY14-like and ZmWRKY62-like in young fruit were significantly higher than those in other tissues,while the expression level of ZmWRKY25-like gene in leaf, spike and young fruit was higher than that in other tissues. The expression levels of three genes under different abiotic stress were also analyzed by real-time qPCR. The expression of ZmWRKY25-like was up-regulated,while ZmWRKY62-like was down-regulated under salt stress. The expression of ZmWRKY62-like was down-regulated under drought stress. Under low temperature stress,the expression level of ZmWRKY25-like was up-regulated. These results indicated that ZmWRKY25-like may be involved into plant response to salt and low temperature stress,and ZmWRKY62-like may be involved into plant response to drought and salt stress.

       

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