Data/hora: 12/06/2024 14:03:53

Provedor de dados: | 1
País: | Brazil
Título: | Resistance to triazole fungicides in Pyricularia species associated with invasive plants from wheat fields in Brazil
Autores: | Dorigan, Adriano Francis; Carvalho, Giselle de; Poloni, Nadia Maria; Negrisoli, Matheus Mereb; Maciel, João Leodato Nunes; Ceresini, Paulo Cezar.
Data: | 2019-05-24
Ano: | 2019
Palavras-chave: | Blast disease; CYP51A gene; Sterol demethylation inhibitor (DMI) fungicides; Epoxiconazole; Tebuconazole; Resistência a fungicidas na agricultura / Fungicide resistance in agriculture.
Resumo: | 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês

Identificador:

http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39332

10.4025/actasciagron.v41i1.39332

Editor: | Universidade Estadual de Maringá

Relação:

http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39332/pdf

http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39332/751375146266

http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39332/751375146267

http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39332/751375146269

Formato:

application/pdf

image/jpeg

image/jpeg

image/jpeg

Fonte:

Acta Scientiarum. Agronomy; Vol 41 (2019): Publicação Contínua; e39332

Acta Scientiarum. Agronomy; v. 41 (2019): Publicação Contínua; e39332

1807-8621

1679-9275

Fonte:

Copyright (c) 2019 Acta Scientiarum. Agronomy

https://creativecommons.org/licenses/by/4.0