作物学报 ›› 2013, Vol. 39 ›› Issue (01): 34-42.doi: 10.3724/SP.J.1006.2013.00034
冯娟,范昕琦,徐鹏,张香桂,沈新莲*
FENG Juan,FAN Xin-Qi,XU Peng,ZHANG Xiang-Gui,SHEN Xin-Lian*
摘要:
CIPK (calcineurin B-like calcium sensor interacting protein kinase)是植物钙感受器钙调磷酸酶B类似蛋白特定靶向的一类丝氨酸/苏氨酸蛋白激酶。在前期的研究中, 我们将棉属野生种D亚组旱地棉(Gossypium aridum)盐胁迫前后RNA混合样品进行转录组测序, 发现一CIPK相关基因存在较高的转录丰度。盐胁迫下荧光定量PCR分析表明该基因在根部表现诱导上调表达, 推测该基因可能参与植物在高盐胁迫下的生理调控。利用电子克隆及RT-PCR方法从旱地棉中克隆了一个ORF全长为1350 bp的蛋白激酶基因GarCIPK8。序列分析表明该基因编码的蛋白含有449个氨基酸, 分子量为51.12 kD, 理论等电点为8.13, 其N端催化结构域包含一个丝氨酸/苏氨酸蛋白激酶域, C端具有植物CIPK蛋白家族特有的24个氨基酸组成的NAF保守结构域; 与水稻OsCIPK8蛋白的相似度为73.95%。为进一步验证其功能, 利用组成型高效强启动子CaMV35S和拟南芥逆境胁迫启动子rd29A构建植物表达载体并转化烟草, 经PCR和RT-PCR分子检测, 证明GarCIPK8基因已经整合到烟草基因组中, 并正常表达。T1代转基因植株耐盐性鉴定结果表明GarCIPK8基因对提高转基因植株的耐盐性有较明显的作用, PEG干旱模拟试验也证明GarCIPK8基因可增强植株的抗旱性。
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