Abstract: According to the incidence of sweet potato infected by Rhizopus nigricans Ehvb.,we established an identification method of sweet potato soft rot resistance for the first time:3 sweet potatos of median size were taken each variety,after strictly disinfected by 75% alcohol and dried,3 potato chips were cut in the middle every sample,each chip's thickness was about 8 mm,then put each chip into a sterilization moist petri dish,with Rhizopus nigricans Ehvb.inoculated on the center of potato chips,then put these petri dishes into a biochemical incubator which temperature was 26 ℃,added sterile water to keep moist.21 hours after the identification of material was cultured,the scab diameter was measured,disease incidence was calculated according to the average scab diameter of grading,and then identity the anti-sense characteristics of varieties.The establishment of this method provide a theoretical basis for the breeding of sweet potato.The resistances of 44 varieties of resources to sweet potato soft rot were identified and evaluated,The results indicated that Lushu 4 and Guangzi 8 showed middle resistance to sweet potato soft rot;Zhanshu 271,Taizhong 11,Yuzi 1,Ganshu 1 and PZJShang 27E₂-2 showed sensitive to sweet potato soft rot,all the other sweet potato varieties were high-sensitive to sweetpotato soft rot.

Key words: Sweet potato soft rot, Variety resources, Identification method of resistance

CLC Number: 

• S531.03