用RNA干扰技术创造高直链淀粉马铃薯材料

被引:42
作者
郭志鸿 [1 ]
张金文 [1 ]
王蒂 [1 ]
陈正华 [2 ]
机构
[1] 甘肃农业大学农学院
[2] 甘肃亚盛集团博士后科研工作站北京分站
关键词
马铃薯; 高直链淀粉; RNA干扰技术; 淀粉分支酶基因;
D O I
暂无
中图分类号
S532 [马铃薯(土豆)];
学科分类号
摘要
【目的】创造块茎高直链淀粉含量的转基因马铃薯材料。【方法】采用RT-PCR技术分别克隆了马铃薯Sbe1基因CDS内300bp的片段SⅠ和Sbe2基因CDS内410bp的片段SⅡ,并将SⅠ和SⅡ顺序连接得到融合片段SⅢ;以载体pHANNIBAL和pART27为基础,构建具有SⅢ反向重复结构的植物表达载体pRNAiⅢ;采用农杆菌介导法转化马铃薯优良品种陇薯3号、甘农薯2号和大西洋。【结果】获得了融合片段SⅢ,构建了以Sbe1基因和Sbe2基因为靶标的RNA干扰载体pRNAiⅢ,通过农杆菌介导法获得了24个转基因株系,其中21个转基因株系试管薯的淀粉粒形态发生明显变化,表观直链淀粉含量介于59.31%~87.14%,比受体材料平均高出3.2倍。RT-PCR分析表明,在8个直链淀粉含量超过80%的转基因株系中检测不到Sbe1和Sbe2基因mRNA的积累。【结论】采用RNAi技术通过沉默内源Sbe1和Sbe2,可获得高直链淀粉含量的马铃薯材料。
引用
收藏
页码:494 / 501
页数:8
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