胡杨CBF基因克隆及冷胁迫下的表达分析
首发时间:2017-04-28
摘要:CBF( C-repeat binding transcription factor/ dehydrate responsive element binding factor, DREB) 基因是植物CBF 抗冷途径的枢纽,主要调控下游大量抗冷基因的表达,对增强植物的抗冷能力极为重要。通过以胡杨总RNA为模板,分别克隆得到PeCBF4a、PeCBF4b 、PeCBF4c 和PeCBF2四个CBF基因。利用进化分析和序列分析发现四个PeCBF基因属于DREB亚家族A1组成员,PeCBF4a、PeCBF4b与拟南芥中的AtDREB1B、AtDREB1A和AtDREB1C具有较高的同源性,PeCBF4 C和PeCBF2与拟南芥中的AtDREB1E、AtDREB1F具有很高的同源性。在冷胁迫表达分析发现,PeCBF4a、PeCBF4b、PeCBF4c和PeCBF2都诱导冷胁迫表达,参与调节植物抗冷机制。对胡杨PeCBF基因的序列分析和表达分析,有助于胡杨抗逆性机制的进一步研究。
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Cloning and cold responsive expression analysis of CBF genes in Populuseuphratica
Abstract:CBF(C-repeat binding transcription factor/ dehydrate responsive element binding factor, DREB) is a hub of cold tolerance pathways in plants. CBF can improve cold tolerance of plants by regulating numerous cold responsive genes downstream. In our study, we cloned four CBF genes (PeCBF4a, PeCBF4b, PeCBF4c and PeCBF2) using total RNA of Populuseuphratica as a template. Four PeCBCloning and cold responsive expression analysis of CBF genes in PopuluseuphraticaF genes obtained belong to members of DREB subfamily A1 by phylogenetic analysis and sequence analysis. PeCBF4a and PeCBF4b have high homology with AtDREB1B, AtDREB1A and AtDREB1C in Arabidopsis thaliana. PeCBF4c and PeCBF2 have high homology with AtDREB1E and AtDREB1F. PeCBF4a, PeCBF4b, PeCBF4c and PeCBF2 were significantly induced in response to cold stress by expression analysis, suggesting that they participated in regulation of cold response mechanism. In conclusion, our results are helpful for further study in mechanism of stress resistance in Populuseuphratica.
Keywords: CBF gene transcription factor evolutionary analysis expression analysis
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