ENDOGENOUS ABSCISIC ACID AND CYTOKININS CHANGES DURING EARLY SOMATIC EMBRYOGENESIS IN CODONOPOSIS PILOSULA (FRANCH) NANNF. TISSUE CULTURE A PRELIMINARY STUDY ON THE MECHANISM OF FERTILIZATION AND SEITING FRUIT OF APPLE Effects on PSⅡ Light Absorption and Utilization of CTK on the Surface of Tomato Ovary and Fruit Effects on PSⅡ Light Absorption and Utilization of CTK on the Surface of Tomato Ovary and Fruit Physiological response of desert plants to watering in hyper arid areas of Tarim River Transformation of PSAG12-ipt Gomphosis Gene into Potato THE RELATIONSHIP BETWEEN ENDOGENOUS HORMONE AND BARREN EAR TIP OF MAIZE Cause of Senescence of Nine Sorts of Flowers Approach to Mechanism of Preserving Fresh for Cut Flowers Simultaneous determination of six endogenous cytokinins components and auxin in plant tissue by high performance liquid chromatography Effect of N and K nutrition on chlorophyll content and endogenous hormones in the process of tobacco senescence