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盐胁迫下dslhcb3和cao基因的表达及类囊体磷酸化状态转化

DOI: 10.3724/SP.J.1145.2011.00851, PP. 851-854

Keywords: 盐藻,实时pcr,lhcb3基因,cao基因,磷酸酯酶,类囊体膜

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Abstract:

lhcⅱ在在类囊体膜中除了进行光能的吸收和传递之外,在维持类囊体膜的结构,调节激发光能在两个光系统之间的分配,光保护以及对各种环境的适应等过程中都起着重要的作用.为揭示盐藻lhcb在盐胁迫下的作用机制,以盐生杜氏藻(dunaliellasalina)为材料,应用实时pcr的方法和蛋白电泳技术,研究lhcb3和叶绿素a加氧酶cao基因在低盐胁迫下的表达变化,以及盐藻类囊体膜的磷酸化水平和磷酯酶的变化.结果表明,在低盐环境下,lhcb3和cao基因的表达活性都呈降低的总趋势,这可能是盐藻适应不同浓度盐环境胁迫的不同反应.类囊体膜蛋白磷酸化水平先是降低,之后有所升高.同时,发现磷酸酯酶有着相同的变化趋势,并在12h时最高.由此认为低盐条件下,类囊体膜蛋白在前期磷酸化水平的降低与磷酸酯酶活性降低有关,但在12h后磷酸化水平有所升高,可能是细胞内平衡调节的结果,即磷酸激酶活性增强的结果.图5参30

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