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CDPK4亚细胞定位、超表达和RNAi载体构建与辣椒转化
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摘要
CDPKs (calcium-dependent protein kinases)是在植物中首先发现的一种钙依赖型蛋白激酶,属于丝氨酸/苏氨酸激酶,可以不经钙调素的作用而直接被钙信号激活,在植物生长发育和适应逆境过程中起重要的调节作用。但其作用机制仍不很清楚。本研究在前期分离获得应答多种逆境的辣椒CaCDPK4全长cDNA的基础上,进一步进行其亚细胞定位以及超表达和RNAi的载体构建和遗传转化,获得辣椒转基因植株,为进一步开展CaCDPK4在辣椒中的功能分析奠定基础。主要结果如下:
     1、通过构建CaCDPK4与YFP融合蛋白的瞬间表达载体,并利用基因枪轰击洋葱表皮进行亚细胞定位,结果表明,CaCDPK4定位于细胞质中。
     2、分别构建了辣椒CaCDPK4的超表达pK7WG2-CaCDPK4、RNAi载体pHELLSGATE12-CaCDPK4,并进行了测序验证。开展了辣椒农杆菌介导的遗传转化,在所获得的转基因植株中,PCR鉴定出3株pK7WG2-CaCDPK4和2株pHELLSGATE12-CaCDPK4的转基因T0代植株。
     以上研究结果为进一步通过超表达和RNAi研究辣椒CaCDPK4候选基因的功能奠定了基础。
CDPKs (calcium-dependent protein kinases), firstly discovered in plants as a calcium-dependent protein kinases, are serine / threonine kinases that can be directly activated by calcium signal independent of calmodulin. The functional identification of CDPKs so far suggested important regulatory roles of CDPKs in plant growth, development and plants stresses responses, but the underlying mechanism remains largely unknown. Our previous work cloned a full length cDNA(CaCDPK4) of CDPKs from pepper cDNA library. In this study, the subcellular localization, the construction of over-expression and RNAi vectors of CaCDPK4 are carried out, and their corresponding transgenic pepper plants are acquired. The main results are as followings:
     1. To identify the cellular localization of CaCDPK4, the transient expression vector of CaCDPK4 fused to YFP protein was constructed, and subcellular localization of CaCDPK4 was determined in onion epidermal cell through gene gun bombardment. The result showed that the CaCDPK4 locate in the cytoplasm.
     2. The over-expression vector pK7WG2-CaCDPK4 and RNAi vector pHELLSGATE12-CaCDPK4 were constructed and verified by sequencing, and their corresponding transgenic pepper plants was acquired by Agrobacterium-mediated transformation method. The result turned among the regenerating plants, 3 plants were pK7WG2-CaCDPK4 positive and 2 plants were pHELLSGATE12-CaCDPK4 positive.
     The results of this study laid foundation for further functional identification of CaCDPK4 by overexpression and RNAi analysis.
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