Establishment of Hairy Root Culture of Autotetraploid Indigoblue Woad Biotransformation of 4-Hydroxybenzen Derivatives by Hairy Root Cultures of Polygonum multiflorum Thunb. Effects of Fungal Elicitors on Cell Growth and Artemisinin Accumulation in Hairy Root Cultures of Artemisia annua Study on Hairy-Root Cultures of Fagopyrum cymosum Effect of temperature on growth and artemisinin biosynthesis in hairy root cultures of Artemisia annua Sterol Composition and Biosynthesis in Hairy Root Cultures of Cassia obtusifolia Studies on biotransformation of arbutin by 4-hydroxy phenol in hairy root of Polygonum multiflorum