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朝鲜碱茅Δ’-吡咯啉-5-羧酸合成酶(P5CS)基因的克隆及表达分析

DOI: 10.7668/hbnxb.2011.06.005, PP. 20-26

Keywords: 朝鲜碱茅,&Delta,&rsquo,-吡咯啉-5-羧酸合成酶,基因克隆

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Abstract:

脯氨酸在提高植物抗逆性方面起着非常重要的作用。本研究以朝鲜碱茅茎叶组织提取的RNA为模板,根据已报道的P5CS基因同源序列设计引物,通过RT-PCR法扩增出1个P5CS的cDNA序列,全长2158bp,是一个完整开放阅读框,编码含716个氨基酸的蛋白,Genebank登陆号为:HQ637435。与其他植物P5CS基因进行同源性比对的结果显示,朝鲜碱茅P5CS基因的核苷酸和氨基酸序列与小麦的同源性最高。并对其信号肽、疏水性、跨膜结构、二级结构和主要功能域做了预测。半定量RT-PCR结果表明,PuP5CS基因在朝鲜碱茅的根部和叶片均有表达,但是根部的表达量较低,叶片中的表达量较高,在4种胁迫处理条件下,表达规律也不尽相同。

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