期刊
POTATO RESEARCH
卷 55, 期 2, 页码 125-134出版社
SPRINGER
DOI: 10.1007/s11540-012-9214-9
关键词
Genotype; Late blight; Phytophthora infestans; Potato; Resistance
类别
资金
- Potato Council
- DEFRA LINK [LK09118]
- Scottish Government
As a result of recent changes in the Phytophthora infestans population in Great Britain, in particular the dominance of one genotype (13_A2) and the possible implications of this change on host resistance ratings, a coordinated programme of testing between SASA and JHI was initiated. Over 3 years of trials (2008-2010), 49 existing cultivars with published resistance ratings of 5 or greater on a 1-9 scale of increasing resistance, 42 new cultivars and a range of appropriate control cultivars were assessed using an isolate of the 13_A2 genotype of P. infestans. The mean resistance rating of 62% of the 49 existing cultivars was reduced by more than the maximum 5% LSD of 1.9. For some cultivars (e.g. Lady Balfour and Stirling), changes in resistance rating were specifically associated with the use of the 13_A2 genotype to inoculate the trials from 2008 onwards. The majority of the 42 new cultivars tested were susceptible to the 13_A2 genotype isolate, scoring 4 or less. However, cultivars with useful resistance were also identified with seven scoring 6 or 7. Published resistance ratings have been revised as a result of this study.
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