home    about    browse    search    latest    help 
Login | Create Account

Genetic structure and pathogenicity of populations of Phytophthora infestans from organic potato crops in France, Norway, Switzerland and the United Kingdom

Flier, W. G.; Kroon, L. P. N. M.; Hermansen, A.; van Raaij, H. M. G.; Speiser, B.; Tamm, L.; Fuchs, J. G.; Lambion, J.; Razzaghian, J.; Andrivon, D.; Wilcockson, S. and Leifert, C. (2007) Genetic structure and pathogenicity of populations of Phytophthora infestans from organic potato crops in France, Norway, Switzerland and the United Kingdom. Plant Pathology, 56, pp. 562-572.

[img] PDF
Limited to [Registered users only]

281Kb

Online at: http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-3059.2007.01571.x?journalCode=ppa

Summary

Genetic variation and pathogenicity of Phytophthora infestans isolates collected from organic potato crops of the susceptible cv. Bintje and the moderately resistant cv. Santé were assessed in France, Norway, and the United Kingdom in 2001 and in Switzerland in 2001 and 2002. Population structures differed considerably between the four P. infestans populations. Those from France, Switzerland and the UK were mainly clonal populations showing restricted levels of genetic diversity, whilst those from Norway were mixed A1 and A2 mating type populations with high levels of genetic diversity, suggesting periodical sexual reproduction. Isolates collected from cv. Bintje were on average more aggressive than or comparable to isolates from cv. Santé. Race complexity varied considerably between the regional P. infestans populations, with isolates from France and Switzerland showing the highest number of virulence factors. In all pathogen samples but the French, isolates collected from cv. Santé were more complex than isolates collected from cv. Bintje. No directional selection towards increased aggressiveness towards the more resistant cultivar Santé was observed. This suggests that there is no shift towards increased levels of pathogenicity in P. infestans populations following the large-scale introduction of more resistant potato varieties in organic production systems in Europe.


EPrint Type:Journal paper
Keywords:Pflanzenschutz, Pflanzenkrankheiten, Kartoffelanbau, Blight-Mop, AFLP fingerprinting, epidemic parameters, epidemiology, potato late blight, race structure
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Root crops
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Plant Protection and Biodiversity
European Union > Blight-Mop
Related Links:http://www.fibl.org/forschung/phytopathologie/index.php
Deposited By: Speiser, Dr Bernhard
ID Code:11106
Deposited On:07 Aug 2007
Last Modified:12 Apr 2010 07:35
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Acknowledgements
Journal 'Plant Pathology'
British Society for Plant Pathology
Blackwell Publishing

Repository Staff Only: item control page