THE DYNAMIC VARIATION OF 20-HYDROXYECDYSONE IN CYANOTIS ARACHNOIDEA Photosynthetic Characteristics of Cyanotis arachnoidea and Their Ecological Significance ROOT CULTURE AND β-ECDYSONE FORMATION OF CYANOTIS ARACHNOIDEA INDUCTION AND CULTURE OF HAIRY ROOTS OF CYANOTIS ARACHNOIDEA