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

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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]
Total Authors: 8
[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
Total Affiliations: 3
Document type: Journal article
Source: PHYTOPATHOLOGY; v. 105, n. 3, p. 284-294, MAR 2015.
Web of Science Citations: 27

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)

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 type: Regular Research Grants
FAPESP's process: 13/03116-0 - Searching for evidences of strobilurin resistance in populations of the wheat blast pathogen Magnaporthe oryzae
Grantee:Samanta Cristiene de Oliveira
Support type: Scholarships in Brazil - Master