作物学报 ›› 2013, Vol. 39 ›› Issue (10): 1739-1745.doi: 10.3724/SP.J.1006.2013.01739
盖江涛,赵团结,李艳*,盖钧镒*
GAI Jiang-Tao,ZHAO Tuan-Jie,LI Yan*,GAI Jun-Yi*
摘要:
腺苷酸激酶(adenylate kinase,ADK)催化ATP+AMP⇔2ADP的可逆反应,是维持细胞能量动态平衡的关键酶,在植物中参与调节生长发育和逆境应答等过程。目前有关大豆ADK的研究还未见报道。本文通过RT-PCR方法,从耐盐大豆品种南农1138-2的叶中克隆到一个腺苷酸激酶基因,命名为GmADK。GmADK的编码区序列(coding DNA sequence, CDS)长804 bp,编码267个氨基酸。预测其蛋白结构含有典型的腺苷酸激酶功能域ATP-AMP(Ap5A)结合位点和AMP结合位点。蛋白序列比对和进化树分析表明,大豆与菜豆(Phaseolus vulgaris)和蒺藜苜蓿(Medicago truncatula)中的ADK序列相似性最高,亲缘关系最近。组织表达显示GmADK基因的表达量在大豆叶和根中高于茎中。荧光定量PCR分析表明GmADK的表达受盐胁迫的调节,且在耐盐(南农1138-2)和盐敏感(科丰1号)品种间存在差异。在叶和根中, 200 mmol L–1 NaCl处理6、12和24 h后,GmADK的表达量在盐敏感品种中比未处理对照有所降低,但在耐盐品种中却比未处理对照升高,因此推测GmADK可能参与大豆对盐胁迫的响应。
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