Re-introduction technology and its application in the conservation of endangered orchid Advances in Diversity and Promotion Mechanism of Endophytic Bacteria Associated with Orchids Inoculation Methods and Effects of Beneficial Symbiotic Fungi of Dendrobium loddigesii Rolfe.(Orchidaceae) A Cytochenfical Study of Acid Phosphatas in the Mycorrhizal Cells of Gastrodia elata Seedling Effects of Lanthanum Nitrate and Orchid Mycorrhizal Fungi on Physiological Characteristics of Dendrobium officinale Interaction between a Dark Septate Endophytic Isolate from Dendrobium sp. and Roots of D. nobile Seedlings