Fusarium poae pathogenicity and mycotoxin accumulation on selected wheat and barley genotypes at a single location in Argentina

Abstract

Fusarium poae is a relatively weak pathogen with increasing importance in cereal grains, principally for the capacity to produce several mycotoxins. In our work we evaluated the pathogenicity and toxin accumulation of individually F. poae isolates on wheat and barley under natural conditions during three years. Analysis of variance detected no significant differences for the interactions and the factor isolate, for both incidence and severity, but found significant differences for year and genotype. Contrast analyses show that Apogee was more susceptible than the other wheat genotypes evaluated, that wheat genotypes were more susceptible than barley genotypes, that durum wheat were more susceptible than bread wheat genotypes, and that barley genotype Scarlett present more symptoms development per spyke than the other barley genotypes tested. No HT-2 and T-2 toxins were detected in grain samples. However, high levels of nivalenol were found in wheat and barley grains. This work underlies the needs of more studies of F.poae-host interaction, in special with barley.