Data/hora: 05/06/2024 01:25:50

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 13/10/2010
Data da última atualização: | 30/04/2018
Autoria: | MIRANDA, B. E. C. de; SUASSUNA, N. D.; REIS, A.
Afiliação: | Bruno Eduardo Cardozo de Miranda, Universidade de Brasília; NELSON DIAS SUASSUNA, CNPA; AILTON REIS, CNPH.
Título: | Mating type, mefenoxam sensitivity, and pathotype diversity in Phytophthora infestans isolates from tomato in Brazil.
Ano de publicação: | 2010
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 45, n. 7, p. 671-679, jul. 2010
Idioma: | Inglês
Notas: | Título em português: Grupo de compatibilidade, sensibilidade ao mefenoxam e diversidade de patótipos de isolados de Phytophthora infestans de tomate no Brasil.
Conteúdo: | The objective of this work was to characterize 79 Phytophthora infestans isolates collected in tomato (Solanum lycopersicum) fields, as to mating type, mefenoxam sensitivity, and pathotype composition. The isolates were sampled in 2006 and 2007 in seven Brazilian states as well as in the Distrito Federal. They were characterised as to mating type (n=79), sensitivity to fungicide mefenoxam (n=79), and virulence to three major resistance genes Ph-1, Ph-2, and Ph-3/Ph-4 (n=62). All isolates were of the mating type A1. Resistant isolates were detected in all sampled states, and its average frequency was superior to 50%. No difference was detected in pathotype diversity, neither between subpopulations collected in 2006 and 2007 nor between isolates grouped as resistant or intermediately sensitive to mefenoxam. All major resistance genes were overcome at different frequencies: Ph-1, 88.7%; Ph-2, 64.5%; and Ph-3/Ph-4, 25.8%. Isolates with virulence genes able to overcome all major resistance genes were detected at low frequencies. Tomato breeding programs in Brazil must avoid the development of cultivars with resistance based exclusively on major genes.
Palavras-Chave: | Disease management; Late blight; Pathogen variability; Solanum lycopersicum var lycopersicum.
Thesagro: | Lycopersicon Esculentum; Requeima.
Thesaurus Nal: | Disease control; Solanum lycopersicum.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/105842/1/Mating-type.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (48296-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS