Influence of biotic and abiotic elicitors on production of tanshinones in Salvia miltiorrhiza hairy root culture Synergistic effects of biotic and abiotic elicitors on the production of tanshinones in Salvia miltiorrhiza hairy root culture Effect of EGTA and La2+ on induction of sesquiterpene cyclase gene expression in leaves of Capsicum annuum by several abiotic elicitors