Species composition, toxigenic potential and aggressiveness of Fusarium isolates causing Head Blight of barley in Uruguay

Dublin Core

Título

Species composition, toxigenic potential and aggressiveness of Fusarium isolates causing Head Blight of barley in Uruguay

Tema

MICROBIOLOGIA
MICOTOXINAS
CEBADA
FUSARIUM
BIBLIOGRAFIA NACIONAL QUIMICA
2018

Abstract

Fusarium Head Blight (FHB) is a major constraint to barley production that substantially reduces yield and grain quality. FHB is also a major food safety concern because FHB pathogens contaminate grain with trichothecenes and other mycotoxins. DNA sequence-based analyses and in-vitro toxin assessments were used to characterize the species and trichothecene chemotype composition of FHB pathogens on barley in Uruguay. F. graminearum was the dominant species (89.7%), and three other members of the F. graminearum species complex (FGSC) were identified as FHB pathogens of barley in Uruguay for the first time. Other minor contributors to FHB species diversity included F. poae, F. avenaceum, F. pseudograminearum and an unnamed species from the F. incarnatum-equiseti species complex (FIESC). Most isolates (89.7%) had the 15-acetyldeoxynivalenol (15-ADON) trichothecene type. However, the results expanded the known area of occurrence within Uruguay for the nivalenol (NIV) toxin type, which was observed among isolates from three species of the FGSC, F. pseudograminearum, and F. poae. Isolates with the 3-acetyldeoxynivalenol (3-ADON) or NX-2 toxin types were not observed, although a previously published multilocus genotyping assay was updated to identify NX-2 strains. Analyses of population structure and comparisons with FHB isolates from wheat in Uruguay indicated that F. graminearum constitutes a single genetic population with no evidence of population differentiation related to the sampled hosts. Inter and intraspecific differences were observed in aggressiveness toward four barley genotypes with different levels of resistance to FHB, and in general nivalenol producers were the least aggressive isolates. Sensitivity to metconazole was approximately 10 times higher than was detected for tebuconazole. This is the first report regarding tebuconazole and metconazole sensitivity for Fusarium species causing FHB in barley in Uruguay, and constitutes an important starting point for monitoring temporal or spatial changes in FGSC sensitivity, which is critical to define FHB management practice

Autor

Garmendia, Gabriela
Pattarino, Luciana
Negrín, Camila
Martínez Silveira, Adalgisa
Pereyra, Silvia.
Ward, Todd J.

Fuente

Food Microbiology  v. 76, 2018. -- p. 426-433

Editor

Elsevier

Fecha

2018

Derechos

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Formato

PDF

Idioma

Inglés

Tipo

Artículo

Identificador

DOI: 10.1016/j.fm.2018.07.005

Document Item Type Metadata

Original Format

PDF
Fecha de agregación
November 14, 2018
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
Etiquetas
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Citación
Garmendia, Gabriela, “Species composition, toxigenic potential and aggressiveness of Fusarium isolates causing Head Blight of barley in Uruguay,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed November 28, 2020, http://riquim.fq.edu.uy/items/show/5381.
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