Phenotypic and pathogenic traits of two species of the Fusarium graminearum complex possessing either 15-ADON or NIV genotype

摘要: Fusarium head blight (FHB) in Brazil is caused mainly by two members of the graminearum species complex, each possessing either a DON/15-ADON chemotype (F. sensu stricto, Fgss) or NIV meridionale, Fmer). In this work, we aimed to characterize and compare isolates belonging species, obtained from wheat barley, relation phenotypic traits (mycelial growth, sporulation germination) pathogenicity (in vitro glume infection vivo central floret inoculation) Brazilian cultivars, Guamirim (moderate susceptible) BRS 194 (susceptible). Results showed significantly higher growth rates, greater spore production quicker germination for Fgss compared Fmer isolates, which were also more sensitivity tebuconazole than isolates. All capable infecting tissues both varieties, with an overall frequency when inoculated cv. BRS194, similar between species. Accordingly, central-floret inoculation assay, aggressive towards Guamirim, but not based on mean area under disease progress curves. It hypothesized that host resistance may play role selection populations field conditions, thus partially explaining dominance associated FHB Brazil.