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核农学报  2011 

玉米S-腺苷甲硫氨酸合成酶基因家族成员在盐胁迫条件下的差异表达

Keywords: 玉米,S-,腺苷甲硫氨酸合成酶(SAMS),盐胁迫,表达分析,半定量RT-PCR

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Abstract:

S-腺苷甲硫氨酸合成酶(SAMS)是植物代谢过程中的一个关键酶,催化甲基供体和化合物前体S-腺苷甲硫氨酸的合成。为研究S-腺苷甲硫氨酸合成酶基因在盐胁迫条件下的响应和功能,以玉米甘油醛-3-磷酸脱氢酶(GAPDH)基因为内参基因,通过半定量RT-PCR法分析玉米SAMS基因在盐胁迫条件下的表达模式。结果表明,玉米SAMS基因家族4个成员(SAMS1、SAMS2、SAMS3和SAMS4)在正常生长(对照)和盐胁迫条件下都表达,对照根茎中的表达量大于叶中。SAMS1受盐胁迫后,茎中表达量降低,而叶中表达量略有增加,根中无明显变化。SAMS2和SAMS4受盐胁迫明显诱导,而SAMS3似乎不受盐胁迫诱导,处理植株与对照株相比均无差异。说明玉米SAMS基因家族的4个基因在表达模式上存在差异,推测在功能上存在分工的不同。

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