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葡萄COR27基因的克隆与抗寒功能研究

DOI: 10.11913/PSJ.2095-0837.2015.30346, PP. 346-354

Keywords: 葡萄,COR27基因,冷处理,抗寒性,转基因拟南芥

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Abstract:

?冬季低温是制约我国葡萄和葡萄酒产业发展的主要因素之一,揭示葡萄在冷胁迫下的信号转导通路、挖掘抗寒相关基因并解析其功能,对高耐寒品种的培育具有重要的理论和应用价值。本研究在欧亚种‘玫瑰香’葡萄(VitisviniferaL.‘MuscatHamburg’)冷胁迫相关转录组分析的基础上,鉴定了一个抗寒候选基因,通过同源性分析将其命名为VvCOR27。VvCOR27基因的cDNA序列(1082bp)中,其开放阅读框(ORF)为909bp,编码302个氨基酸。同源性分析显示,13个物种的COR27蛋白均具有3个特有的保守结构域。定量RT-PCR分析表明,VvCOR27在4℃低温处理24h后大量表达。基于基因组序列的启动子基序分析表明,VvCOR27启动子区均只含有1个EE、EEL、G-box、ABREL元件,其数量少于AtCOR27,这可能是VvCOR27响应冷胁迫较AtCOR27滞后的原因。对3个超表达VvCOR27转基因拟南芥株系的抗寒性鉴定表明,VvCOR27参与了植株对冷胁迫的应答并作为正调控因子增强了植株对冷胁迫的耐受能力。

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