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草业学报  2009 

烟草柠檬酸合成酶基因的克隆及其光诱导型植物表达载体的构建

, PP. 161-167

Keywords: 柠檬酸合成酶基因,光诱导型启动子,植物表达载体,紫花苜蓿,耐铝性

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Abstract:

紫花苜蓿为多年生优质豆科牧草。我国南方地区酸性土壤分布比较广,铝害比较严重,限制了紫花苜蓿在南方地区的推广利用。提高有机酸合成酶基因的表达活性,增加有机酸的合成与分泌,有利于增强植物的耐铝性。本研究根据Genebank中已知的烟草柠檬酸合成酶(CitrateSynthase,cs)基因的序列,通过RT-PCR从烟草总RNA中扩增cs基因的cDNA,亚克隆于T载体得到重组载体pMD18-cs,对pMD18-cs中的插入片断进行核酸序列分析确认为cs基因的cDNA全长。用光诱导型启动子(Rubisco,小亚基的启动子)和双元载体pPZP211构建了cs基因的光诱导型植物表达载体pPZP211-PrbcS-cs,为利用基因工程手段提高紫花苜蓿耐铝毒能力,促进其在南方地区推广利用奠定了物质基础。

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