利用发根农杆菌A4和R1601感染北玄参(Scrophularia buergeriana)叶片外植体, 诱导产生毛状根, 产生的毛状根可在无激素的液体和固体MS培养基上快速生长。rolB基因的PCR检测表明, Ri质粒中的T-DNA片段整合到了北玄参毛状根的基因组中。毛状根在附加0.5 mg·L^-1 6-BA及0.1 mg·L^-1 NAA的MS固体培养基上形成绿色愈伤组织, 之后形成不定芽, 并获得再生植株; 毛状根在附加0.5 mg·L^-1 6-BA及0.02 mg·L^-1 NAA的MS固体培养基上培养约15-20天可直接形成不定芽, 且不定芽的诱导率达85%。

Hairy roots were induced by infecting leaf explants of Scrophularia buergeriana with Agrobacterium rhizo- genes strains A4 and R1601. Hairy roots could grow rapidly and autonomously in liquid or solid plant-growth regulator-free MS medium. The transformation was confirmed by PCR amplification of the rolB gene of the Ri plasmid from S. buergeriana hairy roots. Hairy roots could form green callus in MS medium with 0.5 mg·L^-1 6-BA and 0.1 mg·L^-1 NAA, then regenerated plantlets were induced from the callus. A whole transgenic plantlet was obtained. Adventitious buds could be directly induced from hairy roots in MS medium with 0.5 mg·L^-1 6-BA and 0.02 mg·L^-1 NAA after about 15-20 d, with the induction rate of buds up to 85%.