| Journal: | Acta scientiarum. Agronomy |
| Database: | PERIÓDICA |
| System number: | 000460094 |
| ISSN: | 1679-9275 |
| Authors: | Dorigan, Adriano Francis1 Carvalho, Giselle de2 Poloni, Nadia Maria3 Negrisoli, Matheus Mereb4 Maciel, João Leodato Nunes5 Ceresini, Paulo Cezar2 |
| Institutions: | 1Universidade Federal de Lavras, Lavras, Minas Gerais. Brasil 2Universidade Estadual Paulista "Julio de Mesquita Filho", Ilha Solteira, Sao Paulo. Brasil 3Universidade Estadual Paulista "Julio de Mesquita Filho", Jaboticabal, Sao Paulo. Brasil 4Universidade Estadual Paulista "Julio de Mesquita Filho", Botucatu, Sao Paulo. Brasil 5Empresa Brasileira de Pesquisa Agropecuaria, Centro Nacional de Pesquisa de Trigo, Passo Fundo, Rio Grande do Sul. Brasil |
| Year: | 2019 |
| Volumen: | 41 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English 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 |
| Disciplines: | Agrociencias, Biología |
| Keyword: | Fitopatología, Hongos, Gramíneas, Triazol, Fungicidas, Pyricularia, Trigo, Especies invasoras, Brasil |
| Keyword: | Phytopathology, Fungi, Gramineae, Triazole, Fungicides, Pyricularia, Invasive species, Wheat, Brazil |
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