Establishment of High-frequency in Vitro Regeneration System of Onion Effects of Thidiazuron on Micropropagation ot Ficus benjamina and F.Lyrata THIDIAZURON的细胞分裂素活性研究——Ⅰ.对番木瓜(Carica pentagona)愈伤组织诱导及芽生长的作用 The High-frequency Induction of Adventitious Shoots and Plant Regeneration from Leaf Explants of Phalaenopsis with Added Thidiazuron Thidiazuron induced physiological and biochemical changes in the process of dedifferentiation of Fritillaria ussuriensis A Novel Method Based on Etiolation for Increasing Efficiency of In Vitro Propagation of Populus tomentosa