RELATIONSHIP BETWEEN ULTRASTRUCTURE OF WHEAT MESOPHYLL CELL UNDER WATER STRESS AND DROUGHT-RESISTANCE Effects of silicon on the ultrastructures of wheat radical cells under copper stress. Histological and Ultrastructural Observation Reveals Significant Cellular Differences between Agrobacterium Transformed Embryogenic and Non-embryogenic Calli of Cotton A TAXONOMIC STUDY ON THE GENUS CNIDIUM IN CHINA Effects of Temperature Acclimation Pretreatment on the Ultrastructure of Mesophyll Cells in Young Grape Plants (Vitis vinifera L. cv. Jingxiu) Under Cross-Temperature Stresses Ultrastructure of Oogenesis in Dryopteris crassirhizoma Nakai On the Pollen Morphology and Systematic Position of Trigonobalanus doichangensis Effects of chilling stress on antioxidant system and ultrastructure of walnut cultivars.