摘要:用攜帶植物高效表達載體pCAMBIA1304+和發根型質粒pRiA4,“解除武裝”的重組C58C1工程菌感染粘毛黃芩(Scutellaria viscidula Bunge.)無菌苗的幼莖、子葉、葉片,誘導毛狀根的表達,以建立基于粘毛黃芩毛狀根的高效外源基因表達系統。幼莖毛狀根誘導率最高,達88.9%。PCR擴增檢測粘毛黃芩毛狀根單克隆基因組中的rolC和hygr基因片段,結果表明,pRiA4和pCAMBIA1304+均能整合到粘毛黃芩毛狀根的基因組內,共轉化率達28.1%。
關鍵詞:粘毛黃芩(Scutellaria viscidula Bunge.);毛狀根;共轉化
中圖分類號:S567.23+9 文獻標識碼:A 文章編號:0439-8114(2011)19-4070-03
Establishment of Exogenous Gene Expression System based on Scutellaria viscidula Hairy Roots
WANG Shu-fang1,LI Feng-hua1,SUN Min2
(1. Biology Department, Zunyi Normal College, Zunyi 563002, Guizhou, China;
2.School of Life Sciences, Southwest China University, Chongqing 400715, China)
Abstract: The disarmed Agrobacterium tumefaciens strain C58C1 harboring plasmid pRiA4 and plant expressing vector pCAMBIA1304+ was used to infect the young stem, cotyledons and leaves of Scutellaria viscidula Bunge. to establish a high efficiency exogenous gene expression system. The inducing frequency of hairy roots from stems explants was the highest, which reached up to 88.9%. Transformation of the two plasmids was confirmed by the amplification of rolC and hygr genes from the hairy roots of S. viscidula. The result showed that both the two genes could be integrated into hairy roots of S. viscidula, with a co-transformation rate of 28.1%.
Key words: Scutellaria viscidula Bunge.; hairy roots; co-transformation
粘毛黃芩(Scutellaria viscidula Bunge.)是唇形科(Labiatae)黃芩屬(Scutellaria)多年生草本植物[1,2],其藥用成分主要分布于根部。藥理上已證實其中的主要成分黃芩苷和黃芩苷元有抑菌、清熱、降壓、鎮靜、利尿、利膽、抗炎、解毒及抑制HIV病毒逆轉錄酶活性等作用[3]。隨著對植物代謝網絡認識的加深,應用基因工程技術對植物次生代謝途徑進行遺傳改良已取得了可喜的進展。本研究用攜帶植物高效表達載體pCAMBIA1304+(攜帶一個潮霉素抗性基因hygr)“解除武裝(Disarmed)”的重組C58C1工程菌感染粘毛黃芩無菌苗的不同外植體誘導出毛狀根,建立粘毛黃芩毛狀根的高效外源基因表達系統,以期為其次生代謝產物黃酮類化合物的生物合成關鍵酶基因導入,并實現產業化大量生產奠定基礎。
1材料與方法
1.1菌株及植物材料
重組C58C1工程菌由西南大學廖志華教授惠贈,C58C1本來是根癌農桿菌,經“解除武裝”改造后,保留Helper質粒,導入發根質粒pRiA4,改造后的C58C1失去使植物長冠癭組織的能力,成為發根農桿菌。粘毛黃芩種子購買于山西省絳縣遠博農副產品公司。……