Fusarium poae pathogenicity and mycotoxin accumulation on wheat and barley

STENGLEIN, S.; DINOLFO, I; BARROS, G.; BONGIORNO, F.; CHULZE, S.; MORENO, M.V.

PLANT DISEASE

AMER PHYTOPATHOLOGICAL SOC

Año: 2014 vol. 98 p. 1733 - 1738

0191-2917

Fusarium poae is a relatively weak pathogen with increasing importance in cereal grains, principally for the capacity to produce several mycotoxins. In this study we evaluated the pathogenicity and toxin accumulation of individually F. poae isolates on wheat and barley under natural conditions for three yr. Analysis of variance showed no significant differences for the interactions and the factor isolate for both incidence and disease severity, but significant differences were observed for yr and genotype. Contrast analyses showed that Apogee genotype was more susceptible than the other wheat genotypes evaluated. Wheat genotypes were more susceptible than barley genotypes, that durum wheat were more susceptible than bread wheat genotypes, and that barley genotype Scarlett presents more symptom development per spike than the other barley genotypes tested. Neither HT-2 non T-2 toxins were detected in the grain samples. However, high levels of nivalenol were found in wheat and barley samples. The increased reported isolation of F. poae from wheat and barley, and the high capacity to produce nivalenol of this fungus underlies the needs of more studies on F. poae-host interaction, in special with barley.