CARACTERIZAÇÃO DE RAÇAS FISIOLÓGICAS DE Hemileia vastatrix
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Data
2009
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Resumo
Até o ano de 1983, eram conhecidas no Brasil as raças I, II, III, X, XV, XVII e XXIV de Hemileia vastatrix. Desde então, e apesar da suplantação da resistência de variedades de cafeeiros por novas raças do patógeno, nenhum outro estudo de caracterização foi realizado. Para conhecer as raças de H. vastatrix que ocorrem nas lavouras comerciais e experimentais de cafeeiros foram coletadas 150 amostras de ferrugem em genótipos susceptíveis e resistentes nos estados de Minas Gerais, Espírito Santo São Paulo e Paraná. Em nove, das 150 amostras que estão sendo caracterizadas, foram identificadas, neste trabalho, as raças I (v2,5) em amostra proveniente do Híbrido de Timor, e a II (v5) e III (v1,5) em derivados de C. arábica. A raça II prevaleceu sobre a I e III, sendo identificada em seis das nove amostras analisadas. Em estudo anterior (Tropical Plant Pathology, 2008. p. 212-212, v. 33), em onze da amostras analisadas, foram caracterizadas, além de I e II, as raças XIII (v ?) e XXXVII (v 2,5,6,7 e 9).
Races of Hemileia vastatrix I, II, III, X, XV, XVII and XXIV were characterized in Brazil till 1983. Since then, no other races were identified in spite of the overcome of coffee tree resistant varieties by the pathogen. For this reason, 150 populations of coffee leaf rust were collected in susceptible and resistant genotypes in the states of Minas Gerais, Espírito Santo, São Paulo and Paraná to identify the races of the fungus. In nine, of the 150 samples that are being characterized it was identified the races I (v 2,5) in sample collected from Híbrido de Timor, and the races II (v5) and III (V1,5) in Coffea arábica progenies. The race II prevailed over I and III, being identified in six of the nine analyzed samples. In previous study (Tropical Plant Pathology, 2008. p. 212-212, v. 33), in eleven of the analyzed samples it was characterized, besides the race I and II, the races XIII (v?) and XXXVII (v 2,5,6,7, 9).
Races of Hemileia vastatrix I, II, III, X, XV, XVII and XXIV were characterized in Brazil till 1983. Since then, no other races were identified in spite of the overcome of coffee tree resistant varieties by the pathogen. For this reason, 150 populations of coffee leaf rust were collected in susceptible and resistant genotypes in the states of Minas Gerais, Espírito Santo, São Paulo and Paraná to identify the races of the fungus. In nine, of the 150 samples that are being characterized it was identified the races I (v 2,5) in sample collected from Híbrido de Timor, and the races II (v5) and III (V1,5) in Coffea arábica progenies. The race II prevailed over I and III, being identified in six of the nine analyzed samples. In previous study (Tropical Plant Pathology, 2008. p. 212-212, v. 33), in eleven of the analyzed samples it was characterized, besides the race I and II, the races XIII (v?) and XXXVII (v 2,5,6,7, 9).
Descrição
Trabalho apresentado no Simpósio de Pesquisa dos Cafés do Brasil (6. : 2009 : Vitória, ES). Anais Brasília, D.F: Embrapa - Café, 2011
Palavras-chave
H.vastatrix, Coffea spp., raças fisiológicas., H.vastatrix, Coffea spp., physiological races.
Citação
Lelis, Tiago de Paula; Zambolim, Eunize Maciel; Paixão, Gefferson P.; Caixeta, Eveline Teixeira; Zambolim, Laércio. Caracterização de raças fisiológicas de Hemileia vastatrix. In: Simpósio de Pesquisa dos cafés do Brasil (6. : 2009 : Vitória, ES). Anais Brasília, D.F: Embrapa - Café, 2011 (1 CD-ROM), 4p.