Ri T-DNA对盾叶薯蓣的遗传转化及薯蓣皂甙元产生的影响(英文)  

Genetic Transformation Mediated by Ri T-DNA and the Accumulation of Diosgenin of Dioscrea zigiberensis G.H.Wright

作　　者：刘俊[1] 刘选明[1] 秦玉芝[1] 赵小英[1] 唐冬英[1] 赵李剑[1] 

机构地区：[1]湖南大学生命科学与技术研究院,长沙410082

出　　处：《天然产物研究与开发》2005年第1期59-64,共6页Natural Product Research and Development

基　　金：ThisworkwassupportedbyKeyResearchProjectofHunanProvince(No .0 3NKY10 0 1)

摘　　要：利用农杆菌介导法成功地将RiT-DNA转入药用植物盾叶薯蓣 ,产生了毛状根 ,经分子信标探针检测农杆菌Ri质粒上的T DNA已整合进植物基因组中。研究建立了毛状根大量快速繁殖技术 ,基本技术要求为 :1/ 2MS液体培养基 ,2 8℃培养温度 ,35 0lux弱光条件下有利于毛状根的增殖培养 ,提高生物量。HPLC测定结果显示 ,转基因获得的毛状根其薯蓣皂甙元的含量分别是微块茎、愈伤组织和植物体合成量的 5 . 6 8倍、6 . 12倍和 2 . 6 8倍。This paper reported the technique which was used to induce hairy roots in Dioscrea zigiberensis G.H.Wright.Diverse microcuttings were inoculated with strains of A.rhizogenes in different media.Hairy roots were efficiently induced from micro-tubers by infection with A.rhizogenes strain A 4 and R1601,which exhibited the transformation frequency of 78% and 81% respectively.When sub-cultivated in hormone free MS liquid medium,the root clones grew rapidly and reached stationary phase after 30 d. Real-time PCR analysis indicated that Ri plasmid T-DNA integrated into the genome of transformed roots.HPLC analysis of extracts of hairy roots,micro-tubers,calli and plantlets showed that the content of diosgenin was 8.20,1.44,1.34 and 3.06 mg/g DW,respectively.The diosgenin content significantly increased in hairy roots.Hairy-root appears to be an effective means for commercial application to produce diosgenin from in vitro cell culture.

关 键 词：薯蓣皂甙元 毛状根 盾叶薯蓣 T-DNA 遗传转化 快速繁殖技术 农杆菌介导法 植物基因组 植物体 分子信标 

分 类 号：Q943[生物学—植物学] S567[农业科学—中草药栽培]