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新疆无苞芥Na+/H+逆向转运蛋白基因OpNHX1的克隆、表达分析与功能验证

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Keywords: Na+/H+逆向转运蛋白,无苞芥,抗逆,酵母功能互补

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Abstract:

从耐盐植物无苞芥中克隆获得了1个Na+/H+逆向转运蛋白基因NHX1,命名为OpNHX1(GenBank登录号:KC200248)。OpNHX1基因cDNA全长2153bp,包含一个1605bp的开放阅读框,编码534个氨基酸。系统进化树分析表明,OpNHX1编码产物与拟南芥、小盐芥亲缘关系较近,属于同一进化分支。实时荧光定量PCR分析表明,该蛋白基因在无苞芥根、茎、叶、花和荚果中均有表达,其中茎中表达量最高。半定量RT-PCR分析表明,该基因受高盐、干旱、低温及ABA的诱导上调表达。进一步将该基因在拟南芥中过量表达,显著提高了转基因植株在盐胁迫下的存活率,说明OpNHX1基因参与了植物的耐盐性。酵母功能互补试验结果显示,该基因转化酵母Δnhx1后可以补充NHX1的缺失,表明OpNHX1参与Na+/H+的转运。

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