INVESTIGADORES
CHULZE Sofia Noemi
artículos
Título:
Genetic structure of Fusarium verticillioides population isolated from maize in Argentina
Autor/es:
REYNOSO, M.M; CHULZE, S.N; ZELLER, K.A; TORRES, A.M; LESLIE, J.F
Revista:
EUROPEAN JOURNAL OF PLANT PATHOLOGY
Editorial:
Springer
Referencias:
Año: 2009 vol. 123 p. 207 - 215
ISSN:
0929-1873
Resumen:
Abstract Fusarium verticillioides (sexual stage Gibberella
moniliformis) is a common fungal pathogen of
maize worldwide that also produces fumonisin mycotoxins.
Populations of this fungus can be diverse with
respect to neutral and selectable genetic markers. We
used vegetative compatibility groups (VCGs) and
amplified fragment length polymorphisms (AFLPs) to
evaluate the genetic structure of three F. verticillioides
populations from commercial maize fields in Argentina.
Based on work with similar populations from
outside South America, we expected individuals within
the populations to be genetically diverse, that genotypic
variation would be distributed in a manner
consistent with random mating, and that populations
from different locations would be genetically indistinguishable
from one another. We analysed 62 AFLP loci
for 133 fungal isolates. All three populations were
genotypically diverse but genetically similar and
potentially part of a larger, randomly mating population,
with significant genetic exchange occurring
between the three subpopulations. There was no
evidence for linkage disequilibrium at P=0.05. The
low values of GST, the lack of frequent private alleles,
and the lack of a systemic pattern of linkage
disequilibrium all suggest that sexual reproduction is
sufficiently common in F. verticillioides and that the
dispersal of strains is sufficiently efficient for the
population of F. verticillioides in the main maize
growing region to be a single randomly mating
population with no detectable genetic subdivision.
Thus differences in disease and/or toxin production
observed in this region are best attributed to differences
other than the genetic composition of the population.