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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Resistance to triazole fungicides in Pyricularia species is associated with invasive plants from wheat fields in Brazil

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Author(s):
Dorigan, Adriano Francis [1] ; de Carvalho, Giselle [2] ; Poloni, Nadia Maria [3] ; Negrisoli, Matheus Mereb [4] ; Nunes Maciel, Joao Leodato [5] ; Ceresini, Paulo Cezar [2]
Total Authors: 6
Affiliation:
[1] Univ Fed Lavras, Campus Univ, Lavras, MG - Brazil
[2] Univ Estadual Paulista, Campus Ilha Solteira, Ilha Solteira, SP - Brazil
[3] Univ Estadual Paulista, Campus Jaboticabal, Jaboticabal, SP - Brazil
[4] Univ Estadual Paulista, Campus Botucatu, Botucatu, SP - Brazil
[5] Empresa Brasileira Pesquisa Agr, Ctr Nacl Pesquisa Trigo, Passo Fundo, RS - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Acta Scientiarum. Agronomy; v. 41, 2019.
Web of Science Citations: 0
Abstract

Triazole fungicides have not been effective for managing the wheat blast disease in Brazil. A broad analysis across six geographical populations of Pyricularia graminis-tritici in central-southern Brazil indicated a high level of resistance to triazole fungicides. Since P. graminis-tritici is also associated with others poaceous species, here, we analyzed whether triazole-resistant isolates of the blast pathogen could be recovered from other poaceous hosts that are invasive of sprayed wheat fields. In addition to P. graminis-tritici (Pygt), we also evaluated the levels of sensitivity of three other grass-associated blast pathogens, which included P. grisea (Pg), P. pennisetigena (Pp), and P. urashimae (Pu). Resistance to the triazole fungicides tebuconazole and epoxiconazole was assessed phenotypically based on EC50 values and molecularly by analysis of the presence of mutations in the CYP51A gene, which encodes for the target enzyme 14-alpha-demethylase. We detected triazole-resistant Pyricularia spp. (Pg, Pp, Pu and Pygt) that is associated with Avena sativa, Cenchrus echinatus, Chloris distichophylla, Cynodon sp., Digitaria horizontalis, D. sanguinalis, Panicum maximum or Urochloa spp. The major outcome from our study was the evidence that invasive poaceous species from wheat fields could be an important source of triazole resistant fungal inoculum for the initial phases of the wheat blast epidemics. (AU)

FAPESP's process: 17/50456-1 - Understanding the evolution of fungicide resistance in field populations of the wheat blast pathogen from Brazil: can we learn lessons for future disease management?
Grantee:Paulo Cezar Ceresini
Support Opportunities: Regular Research Grants
FAPESP's process: 15/10453-8 - The rise of Pyricularia tritici sp. Nov. as the wheat blast pathogen in Brazil: sympatric speciation inferred from multilocus gene phylogeny, pathogenicity spectra and avirulence genes evolution
Grantee:Paulo Cezar Ceresini
Support Opportunities: Regular Research Grants
FAPESP's process: 13/10655-4 - Unraveling the local origin of the wheat blast pathogen (Magnaporthe oryzae) in Central-Southern Brazil and evidence for the emergence of resistance to Strobilurin fungicides in the pathogen populations
Grantee:Paulo Cezar Ceresini
Support Opportunities: Regular Research Grants