小麦应答低磷的钙依赖蛋白激酶基因TaCPK1A和TaCPK10的克隆和表达

被引:3
作者
路文静 [1 ]
李瑞娟 [1 ]
李小娟 [1 ]
郭程瑾 [2 ]
谷俊涛 [1 ]
肖凯 [2 ]
机构
[1] 河北农业大学生命科学学院
[2] 河北农业大学农学院
关键词
小麦(Triticum aestivumL.); 钙依赖蛋白激酶; 克隆; 低磷胁迫; 基因表达;
D O I
暂无
中图分类号
S512.1 [小麦];
学科分类号
0901 ;
摘要
采用构建富集磷胁迫特异表达基因cDNA差减文库、序列分析和cDNA-AFLP技术,鉴定了2个应答低磷胁迫的钙依赖蛋白激酶(CDPK)基因的表达序列标签。克隆、测序和比对结果表明,上述基因分别为TaCPK1A和TaCPK10。其cDNA长度分别为2129bp和1696bp,开放阅读框分别为1599bp和1281bp,分别编码532和426个氨基酸;具有CDPK的典型结构特征。系统进化分析表明,上述基因的核苷酸序列同源性低,分别来自不同的祖先。在对低磷胁迫的响应上,TaCPK1A在磷胁迫1~24h范围内根系内的表达水平不断增强,叶内表达水平在1h内明显被诱导,以后保持稳定;TaCPK10在相应磷胁迫时间范围根叶内的表达水平均呈低—高—低变化,在磷胁迫1h的表达被诱导,以后又逐渐降至胁迫前水平。TaCPK1A和TaCPK10对氮、钾胁迫没有应答响应。结果表明,CDPK在介导小麦低磷胁迫的信号转导中具有重要作用,小麦中存在两种或多种CDPK介导的磷酸化过程参与低磷信号的转导。
引用
收藏
页码:1749 / 1754
页数:6
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