Molecular and physiological diversity among Verticillium fungicola var. fungicola

The genetic and physiological variability of Verticillium fungicola var. aleophilum responsible for Agaricus bisporus dry bubble disease in North America is well documented but little is known about the var. fungicola affecting European crops. Variability was assessed within this variety and compare...

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Veröffentlicht in:Mycological research 2006-04, Vol.110 (4), p.431-440
Hauptverfasser: Largeteau, Michèle L., Baars, Johan P.P., Regnault-Roger, Catherine, Savoie, Jean-Michel
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creator Largeteau, Michèle L.
Baars, Johan P.P.
Regnault-Roger, Catherine
Savoie, Jean-Michel
description The genetic and physiological variability of Verticillium fungicola var. aleophilum responsible for Agaricus bisporus dry bubble disease in North America is well documented but little is known about the var. fungicola affecting European crops. Variability was assessed within this variety and compared with that reported for the var. aleophilum. Eighteen isolates of V. fungicola var. fungicola and four var. aleophilum isolates were analysed for DNA polymorphism, mycelial growth, response to biochemicals produced by A. bisporus, fungicide resistance, and pathogenicity assessed by direct inoculation on sporophore or casing contamination. RAPD and AFLP markers delineated three French isolates from a homogeneous group containing the other var. fungicola isolates, but no correlation could be drawn between DNA polymorphism and the various traits studied. The var. fungicola isolates were more susceptible than the var. aleophilum isolates to the antibiosis effect of A. bisporus. Only mycelial growth rate at 23 °C could explain the variability in aggressiveness among the European isolates. The putative effect of the post-incubation temperature on contamination during mushroom cultivation was discussed. This work emphasized that, like the American var. aleophilum, the var. fungicola in Europe is genetically homogeneous, but physiological diversity exists, especially in France where it could be related to less standardized cultural practices.
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subjects Agaricus - physiology
Agaricus bisporus
Cultivated mushrooms
DNA, Fungal - chemistry
DNA, Fungal - genetics
DNA, Ribosomal Spacer - chemistry
DNA, Ribosomal Spacer - genetics
Dry bubble disease
fungicide resistance
Fungicides, Industrial - pharmacology
Fungicolous fungi
genetic polymorphism
Genetic Variation
geographical variation
Life Sciences
microbial physiology
mushrooms
mycelium
Mycelium - growth & development
Mycoparasite
mycoparasites
Nitriles - pharmacology
pathogenicity
Phylogeny
Polymerase Chain Reaction
Polymorphism, Restriction Fragment Length
Random Amplified Polymorphic DNA Technique
RNA, Ribosomal, 5.8S - chemistry
RNA, Ribosomal, 5.8S - genetics
Vegetal Biology
Verticillium - genetics
Verticillium - pathogenicity
Verticillium - physiology
Verticillium fungicola
Verticillium fungicola var. aleophilum
Verticillium fungicola var. fungicola
Virulence
title Molecular and physiological diversity among Verticillium fungicola var. fungicola
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