Abstract
In this study,408 soybean cultivars(lines) were identified for resistance to the strong virulent strains of Fusarium oxysporum and F.solani from northeast China.Results showed that the resistant resources of soybean against F.oxysporum and F.solani were abundant in northeast China.Among 357 soybean cultivars(lines) from Heilongjiang Province,resistant cultivars against F.solani and F.oxysporum accounted for 39.03% and 62.37% respectively.Among 27 soybean cultivars from Jilin Province,resistant cultivars against F.solani and F.oxysporum accounted for 23.46% and 46.91% respectively.Among 24 cultivars from Liaoning Province,resistant cultivars against F.solani and F.oxysporum accounted for 25.00% and 61.11% respectively.Jiaojin05-SH,Heinong65,D09-005,D09-072 and D09-077 from Heilongjiang Province showed resistance against strong virulent strains of F.solani and F.oxysporum from northeast China.There were differences in the virulence of F.solani and F.oxysporum strains from different provinces to the same soybean cultivar(line),so the local Fusarium strain should be selected for resistance identification.Ten major soybean cultivars from northeast China were identified for resistance against eight Fusarium species with strong and weak virulence.The results showed that resistant interac-tions accounted for 74.38% among the 160 interactions,indicating that the resistance against Fusarium root rot existed abundant in soybean cultivars.Suinong28 and Dandou13 were immune to weak virulent F.avenaceum,Heinong44 and dongnong2037 immunized to weak virulence F.oxysporum;and at the same time there was no cultivar resistant to all eight Fusarium species.According to the proportion of resistance interactions and the average disease index,the resistant frequency of ten cultivars descending order were Jiunong28,Jiyu35,Suinong28,Tiedou44,Heinong44,Dandou13,Kenfeng16,Dongnong2037,Liaodou17,Hefeng55.Cultivars shown resistance to both Fusarium strong and weak virulence strains accounted for 71.25%,therefore virulence of Fusarium strain was not taken into account for identifying resistance of soybean cultivar to Fusarium species.
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