The ‘Dr Jekyll and Mr Hyde fungus’: noble rot versus gray mold symptoms of Botrytis cinerea on grapes

Authors

  • Elisabeth Fournier,

    Corresponding author
    • Biologie et Génétique des Interactions Plante-Parasite, INRA-CIRAD-SupAgro, Montpellier Cedex 5, France
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  • Pierre Gladieux,

    1. Ecologie, Systématique et Evolution, Université Paris-Sud, Orsay Cedex, France
    2. Ecologie, Systématique et Evolution, CNRS, Orsay Cedex, France
    3. Plant and Microbial Biology, University of California, Berkeley, CA, USA
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  • Tatiana Giraud

    1. Ecologie, Systématique et Evolution, Université Paris-Sud, Orsay Cedex, France
    2. Ecologie, Systématique et Evolution, CNRS, Orsay Cedex, France
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Correspondence

Elisabeth Fournier, UMR BGPI - Biologie et Génétique des Interactions Plante-Parasite, INRA-CIRAD-SupAgro, TA A 54/K, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France.

Tel.: +33 4 99 62 48 63;

Fax: +33 4 99 62 48 22;

e-mail: elisabeth.fournier@supagro.inra.fr

Abstract

Many cryptic species have recently been discovered in fungi, especially in fungal plant pathogens. Cryptic fungal species co-occurring in sympatry may occupy slightly different ecological niches, for example infecting the same crop plant but specialized on different organs or having different phenologies. Identifying cryptic species in fungal pathogens of crops and determining their ecological specialization are therefore crucial for disease management. Here, we addressed this question in the ascomycete Botrytis cinerea, the agent of gray mold on a wide range of plants. On grape, B. cinerea causes severe damage but is also responsible for noble rot used for processing sweet wines. We used microsatellite genotyping and clustering methods to elucidate whether isolates sampled on gray mold versus noble rot symptoms in three French regions belong to genetically differentiated populations. The inferred population structure matched geography rather than the type of symptom. Noble rot symptoms therefore do not seem to be caused by a specific B. cinerea population but instead seem to depend essentially on microclimatic conditions, which has applied consequences for the production of sweet wines.

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