NDLI: The Effect of a Dominant Phytophthora infestans Genotype (13_A2) in Great Britain on Host Resistance to Foliar Late Blight in Commercial Potato Cultivars

Content Provider	Springer Nature Link
Author	Lees, A. K. Stewart, J. A. Lytt, J. S. Carnegie, S. F. Campbell, H. Roberts, A. M. I.
Copyright Year	2012
Abstract	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.
Starting Page	125
Ending Page	134
Page Count	10
File Format	PDF
ISSN	00143065
Journal	Potato Research
Volume Number	55
Issue Number	2
e-ISSN	18714528
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Genotype Late blight Phytophthora infestans Potato Resistance Agriculture Plant Systematics/Taxonomy/Biogeography Plant Sciences Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Food Science Agronomy and Crop Science

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