INQUINOA   21218
INSTITUTO DE QUIMICA DEL NOROESTE
Unidad Ejecutora - UE
artículos
Título:
Species diversity and toxigenic potential of Fusarium graminearum complex isolates from maize fields in northwest Argentina
Autor/es:
SAMPIETRO, D.A., DÍAZ, C.G., GONZÁLEZ, M.A., VATTUONE, M.A. PLOPER, L.D., CATALÁN, C.A., WARD, T.J.
Revista:
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 145 p. 359 - 364
ISSN:
0168-1605
Resumen:
Members of the Fusarium graminearum species complex (Fg complex) are the causal agents of ear rot in maizeand Fusarium head blight of wheat and other small grain cereals. The potential of these pathogens tocontaminate cereals with trichothecene mycotoxins is a health risk for both humans and animals. A survey ofear rot isolates from maize collected in northwest Argentina recovered 66 isolates belonging to the Fgcomplex. A multilocus genotyping (MLGT) assay for determination of Fg complex species and trichothecenechemotypes was used to identify 56 of these isolates as F. meridionale and 10 isolates as F. boothii.F. meridionale was fixed for the nivalenol (NIV) chemotype, and all of the F. boothii isolates had the 15-acetyldeoxynivalenol (15ADON) chemotype. The results of genetic diversity analysis based on nine variablenumber tandem repeat (VNTR) loci supported the hypothesis of genetic isolation between F. meridionale andF. boothii, and provided little evidence of geographic substructure among populations of the dominantpathogen species, F. meridionale. This is the first study to indicate that F. meridionale and F. boothii may play asubstantial role in the infection and trichothecene contamination of maize in Argentina. In addition,dominance of the NIV chemotype among Fg complex isolates from Argentina is unprecedented, and ofsignificant concern to food safety and animal production.