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Selection for fungicide resistance throughout a growing season in populations of Plasmopara viticola

Matasci, Caterina ; Gobbin, Davide ; Schärer, Hans-Jakob ; Tamm, Lucius ; Gessler, Cesare

In: European Journal of Plant Pathology, 2008, vol. 120, no. 1, p. 79-83

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    Titre
    • Selection for fungicide resistance throughout a growing season in populations of Plasmopara viticola
    Auteur
    • Matasci, Caterina. Plant Pathology, Institute of Integrative Biology (IBZ), ETH Zürich, CH-8092, Zürich, Switzerland
    • Gobbin, Davide. Plant Pathology, Institute of Integrative Biology (IBZ), ETH Zürich, CH-8092, Zürich, Switzerland
    • Schärer, Hans-Jakob. Research Institute of Organic Agriculture, Ackerstrasse, CH-5070, Frick, Switzerland
    • Tamm, Lucius. Research Institute of Organic Agriculture, Ackerstrasse, CH-5070, Frick, Switzerland
    • Gessler, Cesare. Plant Pathology, Institute of Integrative Biology (IBZ), ETH Zürich, CH-8092, Zürich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Journal of Plant Pathology, 2008, vol. 120, no. 1, p. 79-83. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319042
    Summary
    A method for evaluating the potential threat of selection for resistance to organically-based fungicides in populations of P. viticola is needed to screen a large panel of products alternative to copper in organic viticulture. Populations from an unexposed plot were compared throughout one season with a population sprayed with azoxystrobin (Quadris), reported as engendering selection pressure and resistance, and a population sprayed with an organically-based fungicide (Mycosan). The evolution of the three populations was followed with neutral specific SSR markers and with the specific marker for strobilurin resistance, as control of selection for resistant mutants. A reduction in genetic diversity of the P. viticola population was observed in the population sprayed with azoxystrobin, consistent with directional selection toward higher resistance, confirmed by an enhanced frequency of resistant mutants with respect to the unexposed population. In contrast, a higher diversity and a reduced frequency of resistant mutants were observed in the population sprayed with the organically-based fungicide. Assessing a reduction of genotypic diversity allows the detection of selection for resistance and constitutes a valid instrument for screening a large panel of products with non-specific, different and possibly indirect modes of action