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山定子MbFAD2基因的克隆及表达分析

DOI: 10.7668/hbnxb.2014.01.007, PP. 31-35

Keywords: 山定子,MbFAD2,低温处理,表达分析

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Abstract:

以山定子为试材,利用RT-PCR技术从山定子中克隆到油酸去饱和酸酶基因(MbFAD2),该基因的开放阅读框为1149bp,编码382个氨基酸,分子量为97.5112kDa,等电点为5.01,该基因被命名为MbFAD2,在GenBank中的登陆号为KC702671。二级结构分析表明,MbFAD2蛋白分子中,α-螺旋、随机卷曲和不规则卷曲分别为35.86%,16.23%,47.91%。系统进化树关系分析表明,MbFAD2与橡胶树和毛白杨的亲缘关系最近,共同形成一个分支,亲源关系最远的为中间锦鸡儿。对MbFAD2进行蛋白跨膜区分析发现,该蛋白具有6个跨膜区域。通过实时荧光定量表达研究表明:MbFAD2在山定子中的根、茎、叶和花均有表达,其中在花中的表达最高,其次是叶片。4℃低温诱导该基因在一年生山定子叶中快速表达,24h时该基因表达量最高,48h后该基因表达量下降;而在茎中短时间内表达不明显。结果表明:山定子MbFAD2的表达量与低温密切相关。

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