Factors affecting viability and germination of oospores of phytophthora sojae

Our work aims to find a way that can promote germination of oospores in a short time with high germination rate.It was indicated that oospores age,pretreatment temperature,chemicals can affect the viability of oospores of P.sojae in some extent.Pretreating 30 day-old oospores with KMnO4 at the concentration of 0.4 percent for 20 min,or under 35℃ for five days,can promote activation rate of oospores to 58.49 percent and 83.55 percent respectively.The germination rate reached more than 80 percent in the petri-dish with 3mL root exudates from soybean susceptible variety Sloan at 26℃ for seven days.