Compatibilidad vegetativa en una poblacion de Aspergillus parasiticus del agroecosistema maní”.

BARROS, G.G; CHIOTTA, M.L; TORRES, A.M; CHULZE, S.N

Villa Giardino-Cordoba

Jornada; XV Jornadas Científicas de la Sociedad de Biología de Córdoba; 2005

Sociedad de Biología de Cordoba

Aspergillus parasiticus is an important fungus in peanut due to their potential aflatoxigenic. Vegetative compatibility system (VCG) can be used to estimate genetic diversity. The aim of this work was to evaluate the genetic diversity of A. parasiticus population isolated from peanut agroecosystem using VCG analysis. Out of 185 A. parasiticus strains isolated from soil, debris and peanut seeds, we arbitrary selected 63 strains to perform VCG analysis. Based on complementation tests, 24 VCGs were obtained, eleven VCGs contained two or more isolates and 13 VCGs contained only a single isolate. The A. parasiticus population evaluated in this study showed lower genetic diversity index (expressed as the number of groups divided by the total number of isolates = 0.31) compare with A. flavus population (0.56) isolated from the same peanut-growing area in Córdoba Province (Barros et al., 2005). Similar results were found by Horn and Greene (1995) who reported a VCG diversity of 0.22 for A. parasiticus population (76 isolates) from a peanut field in Georgia (USA). These authors proposed that the limited long-range dispersal may restrict the VCG diversity in a given area, since A. parasiticus is rarely detected from air samples (Zummo and Scott, 1990). On the other hand, A. parasiticus is more prevalent in peanuts than in other crops, so that, peanut crop could selectively impact VCG clo