Evaluation of interaction between Brachypodium distachyon roots and Fusarium species
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Evaluation of interaction between Brachypodium distachyon roots and Fusarium species María I. Dinolfo & Mauro Martínez & María S. Nogueira & Paul Nicholson & Sebastián A. Stenglein
Accepted: 15 November 2020 # Koninklijke Nederlandse Planteziektenkundige Vereniging 2020
Abstract Fusarium Head Blight is the most important disease of cereals worldwide. Studies of interactions between different flower/grain pathogenic Fusarium species have been carried out, using the host and tissue from which the fungus was isolated. The aim of the present study was to assess the root responses of Brachypodium distachyon genotypes to Fusarium spp. to provide information about differences in host resistance and/or fungal aggressiveness. A total of 10 isolates of four Fusarium species were selected: F. graminearum, F. pseudograminearum, F. cerealis, and F. poae. A total of seven genotypes of B. distachyon were used: Afghanistan, Iran, Israel, Pakistan, South Africa, Uruguay and Bd genotype 21. Roots were inoculated and the necrosis root length was measured at 2, 4, 6, and 8 days post-inoculation. The results showed that F. graminearum and F. pseudograminearum were the species with the highest AUDPC values followed by F. cerealis that showed an intermediate value of AUDPC. F. poae was the least aggressive species. Regarding Brachypodium, the least affected genotype was Bd 21 and Pakistan, while the remaining genotypes showed differences in susceptibility. M. I. Dinolfo : M. Martínez : M. S. Nogueira : S. A. Stenglein Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CICBA-INBIOTEC-CONICET, Facultad de Agronomía, UNCPBA, Av. República de Italia 780, (7300) Azul, Buenos Aires, Argentina M. Martínez Área de Mejoramiento y Genética Vegetal, Facultad de Agronomía de Azul-UNCPBA, Azul, Buenos Aires, Argentina
To our knowledge, this is the first report showing interaction between F. pseudograminearum, F. cerealis and F. poae with Brachypodium roots. Moreover, variability in susceptibility among Brachypodium genotypes and in Fusarium species aggressiveness was reported. We concluded that B. distachyon roots offer an efficient tissue system model to evaluate interaction with Fusarium spp. Keywords Fusarium . Brachypodium distachyon . Root . Necrosis
Introduction The genus Fusarium is diverse, widespread and commonly found worldwide. These ubiquitous fungi exist in soils, living and dead animals and plants and is probably the most economically important phytopathogenic and toxigenic genus of filamentous fungi in cereals around the world. Among diseases caused by Fusarium, Fusarium Head Blight (FHB) is the best characterised. FHB is P. Nicholson John Innes Centre, Colney Lane, Norwich NR4 7UH, UK S. A. Stenglein (*) Área de Microbiología-Facultad de Agronomía de Azul-UNCPBA, Azul, Buenos Aires, Argentina e-mail: [email protected]
Eur J Plant Pathol
considered as one of the most important plant diseases which results in reduced crop yield and grain quality in cereals such as wheat and barley worldwide. Some Fusarium specie
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