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

Fusarium head blight (FHB) in Brazil is caused mainly by two members of the Fusarium graminearum species complex, each possessing either a DON/15-ADON chemotype ( F. graminearum sensu stricto, Fgss ) or a NIV chemotype ( F. meridionale , Fmer ). In this work, we aimed to characterize and compare iso...

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Bibliographic Details
Published in:European journal of plant pathology 2012-07, Vol.133 (3), p.621-629
Main Authors: Spolti, Piérri, Barros, Nicole C., Gomes, Larissa B., dos Santos, Juliano, Del Ponte, Emerson M.
Format: Article
Language:English
Subjects:
Agriculture
Barley
Biological and medical sciences
Biomedical and Life Sciences
Blight
Dominance
Ecology
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Fungi
Fusarium graminearum
Genotype & phenotype
Genotypes
Germination
glumes
Growth rate
Head
Hordeum vulgare
Infection
Inoculation
Life Sciences
Mycelia
Pathogenicity
Phytopathology. Animal pests. Plant and forest protection
Plant diseases
Plant Pathology
Plant Sciences
Spores
Sporulation
Tebuconazole
Triticum aestivum
Wheat
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Summary:Fusarium head blight (FHB) in Brazil is caused mainly by two members of the Fusarium graminearum species complex, each possessing either a DON/15-ADON chemotype ( F. graminearum sensu stricto, Fgss ) or a NIV chemotype ( F. meridionale , Fmer ). In this work, we aimed to characterize and compare isolates belonging to each species, obtained either from wheat or barley, in relation to phenotypic traits (mycelial growth, sporulation and germination) and pathogenicity (in vitro glume infection and in vivo central floret inoculation) to two Brazilian wheat cultivars, Guamirim (moderate susceptible) and BRS 194 (susceptible). Results showed significantly higher growth rates, greater spore production and quicker germination for the Fgss isolates compared to the Fmer isolates, which were also more sensitivity to tebuconazole than the Fgss isolates. All isolates were capable of infecting glume tissues of both varieties, with an overall higher infection frequency for Fgss than Fmer isolates when inoculated in cv. Guamirim than in cv. BRS194, which showed similar infection frequency between the species. Accordingly, in the central-floret inoculation assay, Fgss isolates were also more aggressive than Fmer isolates towards cv. Guamirim, but not towards BRS194, based on the mean area under disease progress curves. It is hypothesized that phenotypic traits and host resistance may play a role in the selection of more aggressive populations under field conditions, thus partially explaining the dominance of Fgss populations associated with FHB of wheat in Brazil.
ISSN:0929-1873
1573-8469
DOI:10.1007/s10658-012-9940-5