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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Adaptation of Phytophthora infestans to partial resistance in potato: Evidence from French and Moroccan populations
Phytopathology, Volume 97, No. 3, Year 2007
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Description
The use of partially resistant cultivars should become an essential component of a sustainable management strategy of potato late blight, caused by Phytophthora infestans. It is therefore important to determine to what extent P. infestans populations can be selected for increased aggressiveness by potato cultivars with different levels of partial resistance. To this end, we sampled P. infestans populations from France and Morocco, chosen as locations where late blight occurs regularly but which differ in the distribution of potato cultivars. Cross-inoculation experiments were used to determine the aggressiveness of all populations to potato cvs. Bintje (prevalent in France but not grown in Morocco) and Désirée (popular in Morocco but cultivated to a very small extent in France). French populations were more aggressive on cv. Bintje than on cv. Désirée, irrespective of the site they were sampled from. Their aggressiveness increased between early and late samplings, suggesting that both cultivars selected for increased aggressiveness during epidemics. By contrast, Moroccan populations were more aggressive on Désirée, regarded as partially resistant in Europe, than on Bintje, highly susceptible under European conditions. These data indicate that P. infestans populations adapt to locally dominant cultivars, irrespective of their resistance levels, and can therefore overcome polygenic, partial resistance. This adaptive pattern may render partial resistance nondurable if not properly managed. © 2007 The American Phytopathological Society.
Authors & Co-Authors
Andrivon, Didier
France, Rennes
L'institut Agro Rennes-angers
Pilet, Fabian
France, Rennes
L'institut Agro Rennes-angers
France, Paris
Cirad
Montarry, J.
France, Rennes
L'institut Agro Rennes-angers
Hafidi, Majida
Morocco, Fez
Faculté Des Sciences et Techniques de Fès, Université Sidi Mohamed Ben Abdellah
Morocco, Rabat
Institut National de la Recherche Agronomique, Morocco
Corbière, Roselyne
France, Rennes
L'institut Agro Rennes-angers
Achbani, El Hassan
Morocco, Rabat
Institut National de la Recherche Agronomique, Morocco
Pellé, Roland
France, Rennes
L'institut Agro Rennes-angers
Ellissèche, Daniel
France, Rennes
L'institut Agro Rennes-angers
Statistics
Citations: 99
Authors: 8
Affiliations: 4
Identifiers
Doi:
10.1094/PHYTO-97-3-0338
ISSN:
0031949X
Study Locations
Morocco