Evaluation and Screening of Germplasm Resources Resistant to Potato Common Scab
Potato common scab(Streptomyces scabies)is a widespread disease and highly prevalent in recent years in the one cropping zone of northern China,the mixed cropping zone of southwestern China,and the two cropping zone of the Central Plains.The selection and breeding of potato common scab-resistant varieties is the most effective and economical method.The common scab resistance and the yield were evaluated for 31 potato varieties(lines)in 2022 by natural disease nursery method.In 2023,the 12 potato varieties(lines)identified in previous year were repeatedly evaluated.Among the 31 varieties(lines)tested in 2022,11 potato varieties(lines),including'Xisen 5','Z496','Z740','Z759','Z760','Z812','Z917','Z962','Z1148','Z1152'and'Z1356',were resistant and their yields performed well.The repeated test results in 2023 showed that the'Z962'was resistant to common scab(R)for two years,and there was no significant difference in yield compared with the local main variety'Youjin'.The yields of'Z1148','Z1152','Z1356','Z740','Z760'and'Z917'were higher than those of the local main variety,but only the yield of'Z740'was significantly different from the control,and was moderately resistant(MR)to common scab.'Xisen 5'and'Z496'were highly resistant to common scab and could be used as parent materials to create hybrid combinations for common scab resistance breeding.In this study,31 potato materials were evaluated and screened for common scab resistance,which would provide basic materials for common scab resistance breeding,disease prevention and control.
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