Resistance identification of potato germplasm resources to late blight in pot and in field

ObjectiveThe resistance of potato germplasm to late blight was studied to provide scientific basis for breeding and promoting disease-resistant potato varieties and carrying out comprehensive treatment of late blight in Jiangxi.MethodInoculation of detached leaves indoor and natural infection in field were applied to identifying the resis-tance of 35 potato materials to late blight and evaluate the resistance of the tested materials comprehensively.ResultAmong the tested materials,eight materials(Favorita,Zhongshu 3,Zhongshu 10,Zhongshu 13,08HE042-2,N157, N108 and D692) were highly susceptible to late blight,and six materials(Zhongshu 17,07HE147-4,07HE005-06, D516,07HE169-1 and D504)showed high resistance or resistance to late blight in both methods. Cluster analysis showed that the identification results of all the materials were relatively consistent in the two methods except for four materials (08CA0687,Zhongshu 5,Zhongshu 11 and D545).ConclusionThe resistance of detached potato leaves to late blight can basically represent the resistance of potato in adult period. The materials(07HE147-4,07HE005-06,D516,07HE169-1 and D504)with high resistance can be parent material to breed disease resistant potato. Materials with highly resistance to late blight such as Huashu 3,Zhongshu 7 and Zhongshu 17 can be planted widely in Jiangxi.