Isolation and Culture of Parthenocissus tricuspidata and P.quenquefolia Protoplasts STUDY ON COLCHIPLOID OF P.Tricuspidata INDUCED BY COLCHICINES Effect of different nitrogen rates on Parthenocissus tricuspidata Planch seedling growth and nutrient distribution Preliminary Study on Interspecific Incompatibility between Parthenocissus tricuspidata and P.quinquefolia Somatic Embryogenesis of Parthenocissus tricuspidata