APPLICATION OF EXOGENOUS PLANT GROWTH REGULATOR IN PLANT SOMATIC EMBRYOGENESIS Transference of the Gomphosis Gene PSAG12-ipt Into Cherry Tomato Effects of Two Kinds of Cytokinins on Shoot Regeneration from Cotyledonary Explants of Chinese Cabbage Effects of Spraying Cytokinin on Abscission Rate and Enzymic Activity of Flowers and Pods of Cowpea Influence of NO3-∶ NH4+ ratio on growth and chlorophyll content in pakchoi The Role of Cytokinins in Retarding of Senescence in Plants Effects of Rhizosphere Nitrate and Ammonium on the Level of Cytokininsand Leaf Growth of Malus hupenensis Rehd. Effects of Rhizosphere Nitrate and Ammonium on the Level of Cytokininsand Leaf Growth of Malus hupenensis Rehd. A Comparative Study on the Role of Cytokinins in Caryopsis Development in the Maize miniature1 Seed Mutant and its Wild Type Effect of Cytokinins on Callus Growth and Antioxidant System in Zoysia matrella (L.) Merr. EFFECT OF AUXIN ANDCYTOKININ ON REGULATION OF ROOTRESPONSES TO IRON DEFICIENCY OF PEA PLANTS