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棉花中一个新型转录因子GhWRI1的表达特征与功能分析

, PP. 80-86

Keywords: WRI1基因,转录因子,AP2结构域,转录激活试验,棉花

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Abstract:

AP2(APETALA2)/EREBP(ethylene-responsiveelementbindingprotein)是一类特异性存在于植物中的转录因子,在植物中的许多代谢过程都起着十分重要的作用。从棉花中分离并获得了一个新的AP2基因GhWRI1,该基因长1314bp,所编码的蛋白含有437个氨基酸,分子量约为48kD,pI为5.77。序列分析结果显示,GhWRI1蛋白含有2个AP2结构域,该蛋白属于AP2家族;与GFP蛋白的融合表达试验结果显示,在洋葱表皮细胞中,GhWRI1是特异性在细胞核中表达的。Real-timeRT-PCR数据显示GhWRI1主要在真叶、根、纤维以及种子中表达,而且其在纤维和种子中的表达量是随着发育时间的推移而不断升高的。同时构建了GhWRI1与LUC共表达的载体,通过检测LUC的活性来反映GhWRI1的表达量,试验数据显示,当GhWRI1与LUC共表达后,LUC的活性提高了约20倍。试验结果都显示GhWRI1是一个很强的转录激活子。

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