Biological species in the Gibberella fujikuroi species complex isolated from maize kernels in Argentina

REYNOSO, M.M; TORRES, A.M; CHULZE, S.N

Plant Pathology Journal

Ansijournals.com

Lugar: Pakistan; Año: 2006 vol. 5 p. 350 - 355

1812-5387

  Maize (Zea mays L) is one of the main crops in Argentina. The production is about 15 million tons per year, primarily in three provinces, Buenos Aires, Santa Fe, and Cordoba; 48% of the production is devoted to the external market. Fusarium species, section Liseola, were the dominant species isolated from maize in Argentina. The present study was carried out to evaluate Fusarium species, section Liseola, isolated from maize from a population level point of view. Three mating populations among the Gibberella fujikuroi complex were found Fusarium verticillioides (Sacc.) Nirenberg (= Fusarium moniliforme Sheldon = Gibberella fujikuroi mating population A, teleomorph, Gibberella moniliformis Wineland), Fusarium proliferatum (Matsushima) Nirenberg (= G. fujikuroi mating population D; teleomorph, G. fujikuroi (Sawada) Wollenw. var. intermedia Kuhlman) y Fusarium subglutinans (Wollenweber & Reinking) Nelson, Toussoun and Marasas (=G. fujikuroi mating population E; teleomorph = G. subglutinans (Edwards) Nelson, Toussoun and Marasas. Both mating types were observed MAT-1 / MAT-2 in the three populations, the allele frequencies were different according to the mating population evaluated. The effective population number (Ne) based on mating type (Ne(mt)) and hermaphrodite frequency (Ne(f)) showed that sexual reproduction was more frequent among members of mating population A, following in order, the mating population D and E respectively. The mating population A will be able to recombine by sexual reproduction so that it will have more adaptive advantages to the selection pressures. The present study contribute with valuable information on Fusarium species section Liseola (Gibberella fujikuroi complex) isolated from maize in Argentina from the population level point of view.