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酵母pac1基因介导对葡萄B病毒的抗性

, PP. 538-543

Keywords: 酵母pac1基因,遗传转化,葡萄B病毒,抗性

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Abstract:

为明确广谱性抗病毒基因―酵母pac1基因对葡萄B病毒(GrapevinevirusB,GVB)的抗性效果,通过农杆菌介导的遗传转化,将pac1基因导入西方烟37B,对转基因植株进行PCR鉴定及Southernblot分析,通过病毒摩擦接种观察症状以及实时荧光定量RT-PCR检测植株体内病毒含量,并对转基因植株抗病性进行初步鉴定。结果表明,目的基因pac1成功导入并整合至西方烟37B基因组,共获得10个转基因株系。不同株系的T1代烟草中阳性植株比例为16.7%~72.7%,表明目的基因可成功遗传到子代。接种病毒后转基因植株普遍延迟发病,但后期症状与非转基因对照相似,其中仅1个转基因株系B6具有不表现典型症状等抗性反应。接种植株病毒含量检测中,所有转基因植株均检测到病毒存在,但表现为抗病的B6株系中病毒含量显著低于非转基因对照,表明该转基因植株虽不能完全抵抗GVB侵染,但对GVB具有耐病性。

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