作　　者： ; ; ;

机构地区： 华南理工大学生物科学与工程学院

出　　处： 《安徽农业科学》 2012年第16期8818-8822,共5页

摘　　要： [目的]将双链RNA介导的基因沉默与发根农杆菌瞬间表达渗入相结合,为植物功能基因的研究提供一套有效的方法。[方法]构建含gfp基因、CaMV 35S启动子及基于何首乌中芪合酶Fm STS基因序列设计的双链RNA的干扰重组质粒pBIN-35S-正向-反向-GFP(干扰),并将其与空白表达质粒pBIN-35S-GFP(空白)分别导入野生型发根农杆菌MSU440中,转化何首乌无菌苗的叶片,诱导生成毛状根。[结果]双链RNA介导的芪合酶Fm STS基因表达沉默,空白对照组二苯乙烯苷含量为2.18 mg/g,是双链RNA干扰组(0.65 mg/g)的3倍多。[结论]应用dsRNA介导的RNAi能有效沉默何首乌Fm STS基因,芪合酶Fm STS基因是何首乌中二苯乙烯苷合成代谢的关键酶基因。 [Objective] To construct an effective method for studying the plant gene function by the way of binding the double-stranded RNA-mediated gene silencing with the transient expression of Agrobacterium rhizogenes.[Method] A novel expression vector pBIN-35S-forward-reverse-GFP was constructed from the plasmids which included gfp gene driven by the CaMV 35S promoter and the forward/reverse direction sequence based on double stranded RNA.The hairy roots of Polygonum multiflorum Thunb.were induced by wild-type Agrobacterium rhizogenes MSU440.[Result] The double-stranded RNA induced the gene silencing of FmSTS.The content of 2,3,5,4＇-tetrahydroxy-stilbene-2-O-β-D-glycoside in blank group（2.18 mg/g dry weight） was more than three times that in RNAi group（0.65 mg/g dry weight）.[Conclusion] The gene silencing of FmSTS was effectively induced by dsRNA-mediated RNA interference,and the gene FmSTS is the key enzyme gene in the synthesis of 2,3,5,4＇-tetrahydroxy-stilbene-2-O-β-D-glycoside.

关 键 词： 何首乌 二苯乙烯苷 毛状根 次级代谢

领　　域： [农业科学]