Characterization of <Emphasis Type="Italic">Phytophthora infestans</Emphasis> Isolates from Jersey,Channel Islands |
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| Authors: | Kenneth L Deahl Frances M Perez Jonathan M Thompson Caoimhe Fleming-Archibald Stephen Thompson Rosemary Collier Steven Kildea Louise R Cooke |
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| Institution: | (1) USDA, ARS/PSI, Genetic Improvement of Fruits and Vegetables Laboratory, Beltsville, MD 20705, USA;(2) School of Biological Sciences, The Queen’s University of Belfast, Belfast, UK;(3) States of Jersey Planning and Environment Department, Environment Division, Howard Davis Farm, La Route de la Trinite, Trinity, Jersey, JE3 5JP, Channel Islands;(4) Applied Plant Science & Biometrics Division, Agri-Food & Biosciences Institute, Newforge Lane, Belfast, BT9 5PX, UK;(5) Teagasc Crops Research Centre, Oak Park, Carlow, Ireland; |
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| Abstract: | Potato production on the island of Jersey, in the English Channel, is dominated by Jersey Royal, a selection of the early
cultivar International Kidney. Jersey Royal is very susceptible to Phytophthora infestans, the cause of potato late blight, and Jersey’s climate is frequently conducive to infection. During 2004–2006, isolates of
P. infestans were obtained from Jersey Royal plant samples from 41 different sites (24 crops, one infected tuber, 16 volunteers) and from
five outdoor tomato crops and characterised by mating type, mtDNA haplotype, Gpi and Pep allozyme genotype, metalaxyl resistance and RG57 fingerprint. A subset of 17 isolates was additionally characterised by simple
sequence repeat (SSR). All but one isolate from potato belonged to a single A1 multilocus genotype or a variant. The five
isolates from tomato represented three distinct genotypes, none of which was found on potato and included one which was A2
mating type. The populations of P. infestans on potato and tomato in Jersey appear distinct, with that on potato being highly clonal. |
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