Toxigenic potential of Fusarium graminearum sensu stricto isolates in wheat kernels in Argentina

ALVAREZ, CL, AZCARATE, MP, CABRAL, D, FERNÁNDEZ PINTO, V.

INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY

Elsevier

Lugar: Amsterdam; Año: 2009 vol. 135 p. 131 - 135

0168-1605

ABSTRACT The toxigenic potential of 144 Fusarium graminearum sensu stricto strains isolated from wheat in different subregions in the main production area in Argentina during both epidemic (2001) and non-epidemic (2003-2004) cropping seasons was investigated.. Mycotoxin production of the isolates was examined by Gas Chromatography with Electron Capture Detection and confirmed by Mass Spectrometry. Analysis of trichothecene chemotype distribution across wheat Argentinean cropping area revealed that 15 acetyldeoxynivalenol chemotype was the more common type. Two other types, the 3 acetyldeoxynivalenol and 3- and 15- acetyldeoxynivalenol chemotype were always present. The isolates belonging to 3 acetyldeoxynivalenol chemotype accumulated the higest trichothecene quantities. The number of isolates with simultaneous production of both acetylderivatives was increasing along with years. The frequency of isolates with different toxigenic profile did not show significant differences by subregions. This was the first study of chemotype distribution undertaken in Argentina with a large population identified as F. graminerum sensu stricto . Keywords: Fusarium graminearum sensu stricto, Deoxynivalenol, 3-acetyldeoxynivalenol, 15-acetyldeoxynivalenol.