Main Factors Influencing the Frequency of Direct Organogenesis of Cucumberin Vitro Studies on the Anther Culture of Oryza rufipogen Griff Ⅰ.Studies on the Enhancement of the Induction Rate of Callus and the Differentiation Rate of Green Plantlet STUDIES ON RICE EMBRYOGENIC CALLUS INDUCTION AND SEVERAL TECHNICAL PARAMETERS FOR THEIR GENETIC TRANSFORMATION EFFECT OF ~(60)Co γ-RAYS IRRADIATION PRETREATMENT ON CALLUS INDUCTIVITY AND DIFFERENTIATION OF STRAWBERRY ANTHER Establishment of an efficient regeneration system of Jijing88