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核农学报  2015 

玉米转录因子基因ZmPTF1在转基因烟草中的表达

DOI: 10.11869/j.issn.100-8551.2015.04.0692, PP. 692-698

Keywords: ZmPTF1,烟草,萌发,α-淀粉酶,southern杂交

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Abstract:

为了探讨转录因子基因ZmPTF1在玉米种子萌发中的作用,本研究根据GenBank中收录的玉米PTF1序列设计PCR引物,利用普通玉米自交系A318克隆得到ZmPTF1的全长cDNA序列.该序列开放阅读框包括1446bp碱基,由481个氨基酸组成.本文构建植物表达载体PCAMBIA3301-ZmPTF1转化烟草W38,经过抗生素筛选和PCR鉴定得到转基因阳性烟草,对2株生长正常的T1转基因烟草进行southern杂交分析及RT-PCR检测,结果表明外源ZmPTF1已经整合进了烟草基因组中并且能正常转录并遗传.与对照相比,转基因烟草种子的发芽率、发芽势及萌发种子α-淀粉酶活性显着增高,表明ZmPTF1基因过表达会促进烟草种子提前解除休眠进入发芽阶段,提高烟草种子发芽势和发芽率.该研究结果为进一步研究ZmPTF1基因的功能提供理论依据.

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