Changes of L-phenylalanin ammo-nialyase Activity in Soybean inoculated with Phytophthora sojae

Soybean Phytophthora root rot is a serious Phytophthora disease.L-phenylalanin ammo-nialyase(PAL)as a key metabolic enzyme that linked the primary and secondary metabolism,is important to disease resistance of plant.To discuss the relationship between PAL activity and Phytophthora root rot resistance in soybean.Soybean cultivars resistant or sensitive to Phytophthora root rot were inoculated with Phytophthora sojae race 1,and the PAL activity before inoculation and 24,48,72 and 96 h after inoculation was determined.The result showed that the PAL enzymatic activity changed regularly after being inoculated by Phytophthora sojae race 1,while the changing ranges were different in resistant and sensitive soybean cultivars.Therefore,there is some relationship between the PAL activity and the resistance of soybean to Phytophthora root rot.