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flavus est un agrégat d'espèces, que les génotypes sont dispersés sur de grandes surfaces, et que la production d'aflatoxine est plus stable en nature qu'en culture. flavus et les espèces étroitement reliées. flavus, mais ne le sont pas toujours entre les isolats d' A. L'hybridisation Southern de huit produits d'amplification de l'ADN montre que les bandes en co-migration, amplifiées avec la même amorçe, sont toujours homologues à l'intérieur de l' A.
Tous les isolats S forment un seul clade, apparemment dérivé du groupe L. flavus, basée sur la morphologie et la physiologie, est fortement associée avec à la fois les groupes de compatibilité végétative et les polymorphismes de l'ADN. Une dichotomie déjà décrite entre les isolats S et L de l' A. i) the search for effective and specific biological control agents will have to occur.
L'analyse cladistique des polymorphismes de l'ADN concorde avec les données sur la compatibilité végétative. Geographic Origins, Multiple Introductions and Founder Effects. La production d'aflatoxine B 1 diffère significativement entre les groupes de compatibilité végétative les isolats étroitement reliés ont des toxicités similaires indépendamment de l'origine géograhique. Les auteurs ont caractérisé des isolats l' Aspergillus flavus appartenant à au moins 12 groupes de compatibilité végétative quant à leur production d'aflatoxine in vitro, leur morphologie et le polymorphisme de l'ADN amplifié de façon aléatoire. Key words: vegetative compatibility groups, random amplified polymorphic DNA, sclerotia, aflatoxin.
flavus is a species aggregate, that genotypes are dispersed over wide areas, and that aflatoxin production is more stable in nature than in culture. flavus but were not always homologous between A. Southern hybridizations of eight DNA amplification products showed that comigrating bands amplified by the same primer were always homologous within A. All S isolates formed a single clade, apparently derived from the L group. flavus based on morphology and physiology was strongly associated with both vegetative compatibility groups and DNA polymorphisms. A previously described dichotomy between S and L isolates of A. Cladistic analysis of DNA polymorphisms was consistent with vegetative compatibility data. Aflatoxin B 1 production differed significantly among vegetative compatibility groups closely related isolates were similar intoxigenicity regardless of geographic origin. Isolates of Aspergillus flavus belonging to at least 12 vegetative compatibility groups were characterized by aflatoxin production in vitro, morphology, and random amplified polymorphic DNAs.
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