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杨树类锌指基因ZFL的功能分析

, PP. 562-570

Keywords: 杨树,PtrZFL,QRT-PCR,启动子,胁迫

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Abstract:

以毛果杨叶片cDNA为模板,采用PCR技术分离出杨树ZFL基因,序列分析结果表明该基因序列开放读码框315 bp,共编码104个氨基酸,推导的蛋白质分子量为11.202 kDa,理论等电点9.83,命名为PtrZFL。对ZFL基因进行实时荧光定量PCR表达分析,结果表明:甘露醇、NaCl、H2O2、ABA、低温胁迫都能诱导PtrZFL基因的表达,且PtrZFL表达量在ABA处理3 h时达到最高,然后随处理时间延长而逐渐降低;低温(4℃)胁迫在6 h后能显著诱导PtrZFL基因表达,并随着低温处理能一直保持较高水平的表达。根据毛果杨基因组信息设计引物,获得了PtrZFL基因上游1 000 bp的启动子序列,序列分析结果表明该启动子包含有多个与胁迫相关的元件,如抗冻、缺水、抗寒、脱落酸响应元件ABRE、MYB 和WRKY。GUS活性检测发现,该启动子在转基因拟南芥整株中都有表达,但在根部和成熟叶片中表达较强,其他位置表达微弱。

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