Biological Species in the Gibberella fujikuroi Species Complex Isolated from Maize Kernels in Argentina

摘要

The present study was carried out to evaluate Fusarium species within the Gibberella fujikuroi species complex isolated from maize from a population level point of view. Three mating populations among the G. fujikuroi species complex were found, Fusarium verticillioides (Sacc.) Nirenberg (= F. moniliforme Sheldon = G. fujikuroi mating population A; teleomorph, G. moniliformis Wineland), F. proliferatum (Matsushima) Nirenberg (= G. fujikuroi mating population D; teleomorph, G. intermedia (Kuhlman) Samuels etal.) and F. subglutinans (Wollenweber and Reinking) Nelson, Toussoun and Marasas (= G. fujikuroi mating population E; teleomorph, G. subglutinans (Edwards) Nelson, Toussoun and Marasas). Both mating types were observed MAT-1IMAT-2 in the three populations; the allele frequencies were different according to the mating population evaluated. The effective population number (N,) based on mating type [N] and hermaphrodite frequency [N] showed that sexual reproduction was more frequent among members ofG. moniliformis population, following in order, G. intermedia and G. subglutinans populations, respectively. G. moniliformis will be able to recombine by sexual reproduction so that it will have more adaptive advantages to the selection pressures. The present study contributes with valuable information on G. fujikuroi species complex isolated from maize in Argentina from a population level point of view.