Vegetative compatibility in a population of Aspergillus parasiticus from peanut agroecosystem

BARROS GERMAN; CHIOTTA MARIA LAURA; TORRES ADRIANA; CHULZE SOFIA

BIOCELL

INST HISTOL EMBRIOL-CONICET

Lugar: Mendoza; Año: 2005 vol. 29 p. 220 - 220

0327-9545

Aspergillus parasiticusis an important fungus in peanut due totheir potential aflatoxigenic. Vegetative compatibility system(VCG) can be used to estimate geneticdiversity. The aim ofthis work was to evaluate the genetic diversity of A.parasiticus population isolated from peanut agroecosystemusing VCG analysis. Out of 185 A. parasiticus strains isolatedfrom soil, debris and peanut seeds, we arbitrary selected 63strains to perform VCG analysis. Based on complementationtests, 24 VCGs were obtained, eleven VCGscontained two ormore isolates and 13 VCGscontained only a single isolate. TheA. parasiticus population evaluated in this study showed lowergenetic diversity index (expressed as the number of groupsdivided by the total number of isolates= 0.31) compare withA. 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) whoreported a VCG diversity of 0.22 for A. parasiticuspopulation(76 isolates) from a peanut field in Georgia (USA). Theseauthors proposed that the limited long-range dispersal mayrestrict the VCG diversity in a given area, since A. parasiticusis rarely detected from air samples (Zummo and Scott, 1990).On the other hand, A. parasiticusis more prevalent in peanutsthan in other crops, so that, peanut crop could selectivelyimpact VCG clonal densities in field soil.