Resistance to QoI Fungicides Is Widespread in Brazilian Populations of the Wheat Blast Pathogen Magnaporthe oryzae

Autor(es)

Castroagudin, Vanina L. ^[1] ; Ceresini, Paulo C. ^[1] ; de Oliveira, Samanta C. ^[1] ; Reges, Juliana T. A. ^[1] ; Maciel, Joao L. N. ^[2] ; Bonato, Ana L. V. ^[2] ; Dorigan, Adriano F. ^[1] ; McDonald, Bruce A. ^[3]

Afiliação do(s) autor(es)

^[1] UNESP Univ Sao Paulo State, Ilha Solteira, SP - Brazil

^[2] Empresa Brasileira Pesquisa Agr EMBRAPA Trigo Whe, Passo Fundo, RS - Brazil

^[3] Swiss Fed Inst Technol, Inst Integrat Biol, Zurich - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: PHYTOPATHOLOGY; v. 105, n. 3, p. 284-294, MAR 2015.
• Citações Web of Science: 27

Resumo

Wheat blast, caused by Magnaporthe oryzae, is an important disease across central and southern Brazil. Control has relied mainly on strobilurin fungicides (quinone-outside inhibitors {[}Qols]). Here, we report the widespread distribution of Qol resistance in M. oryzae populations sampled from wheat fields and poaceous hosts across central and southern Brazil and the evolution of the cytochrome b (cyt b) gene. Sequence analysis of the cyt b gene distinguished nine haplotypes, with four haplotypes carrying the G143A mutation associated with Qol resistance and two haplotypes shared between isolates sampled from wheat and other poaceous hosts. The frequency of the G143A mutation in the wheat-infecting population increased from 36% in 2005 to 90% in 2012. The G143A mutation was found in many different nuclear genetic backgrounds of M. oryzae. Our findings indicate an urgent need to reexamine the use of strobilurins to manage fungal wheat diseases in Brazil. (AU)

• Processo FAPESP: 13/10655-4 - Desvendando a origem local da brusone do trigo (Magnaporthe oryzae) no Centro Sul do Brasil e evidências da emergência de resistência a fungicidas estrobilurinas em populações do patógeno
• Beneficiário: Paulo Cezar Ceresini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/03116-0 - Em busca de evidências de resistência a estrobirulina em populaçoes de Magnaporthe oryzae do trigo.
• Beneficiário: Samanta Cristiene de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Mestrado