Abstract: In the present experiment,the resistance identification and evaluation of total 13 kiwifruit cultivars in Actinidia chinensis and A. chinensis var. deliciosa to Pseudomonas syringae pv. actinidiae (Psa) was conducted indoors by using wounding method on detached branches.The results showed that the incidence rate,onset time and lesion length of the isolated branches in all tested materials were significantly different after pathogenic bacteria inoculation.The order of resistance of the above cultivars was listed as follows:Miliang-1＞Miliang-2＞Chuhong＞Cuiyu＞Beimu＞Xiangbiyu＞Xiangji＞Xiangjihong＞Wuzhi-3＞Jinyan＞Donghong＞Guichang＞Hongyang,according to the disease lesion length from small to large,at the 25 d after infected Psa.A. chinensis var. deliciosa Miliang-1 was evaluated as the high resistance (HR) cultivar and A. chinensis Hongyang as the high susceptibility (HS) cultivar.The content of soluble sugar in branches decreased significantly after infected Psa,and the higher of the soluble sugar content after infection,the stronger resistance the cultivar had.However,no correlation was observed between the Psa resistance and reducing sugar content,lenticels characters and cortex thickness,respectively.

Key words: kiwifruit, cultivar, bacterial canker of kiwifruit, resistance evaluation, soluble sugar