Objective: To study the effects of different phytohormones on the growth of hairy root and biosynthesis of tanshinone II A in Salvia miltiorrhiza.
Methods: Salvia miltiorrhiza hairy root was induced by organizational culture method. Tanshinone was extracted with ultrasonic method and detected by high performance liquid chromatography (HPLC).
Results: The phytohormone combination of GA3 and 6-BA at different concentrations adding to 1/2 MS medium had obviously inhibitory effect on the hairy root growth of Salvia miltiorrhiza. And the highest inhibition rate was up to 100% (hairy roots were death). However, the growth of hairy roots could be obviously promoted by the combination of KT (1.0 mg/L) and IBA (1.0 mg/L), increasing 3. 251 times than that of the control. Total tanshinone II A content in hairy roots bodies was the highest under the combination of 0.2 mg/L NAA and 3.0 mg/L 6-BA. 6-BA of 2.0 mg/L played a significant role in promoting tanshinone II A biosynthesis, and the tanshinone II A concentration was 3.012 times higher than that of the control.
Conclusion: Different phytohormones and its combination adding to 1/2 MS medium has significant influence on the hairy root growth and the content of tanshinone II A in Salvia miltiorrhiza.