Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/23100
Tipo: Artigo
Título: The population structure of Hemileia vastatrix in Brazil inferred from AFLP
Autor(es): Maia, T. A.
Caixeta, E. T.
Mizubuti, E. S. G.
Zambolim, L.
Maciel-Zambolim, E.
Abstract: Efforts to obtain durable resistant cultivars to coffee leaf rust have a long history of disappointment because of the lack of information on the Hemileia vastatrix evolutionary potential. In this study, the AFLP marker was used to analyze the genetic structure of a field population of H. vastatrix from different coffee genotypes cultivated in a wide geographic region of Brazil’s main production areas. A total of 91 isolates were sampled from genotypes of Coffea arabica, C. canephora and Híbrido de Timor/Icatu derivatives. Each isolate exhibited unique multilocus AFLP genotypes with no identical isolates obtained from the same geographical and host origins. This finding was corroborated by a small correlation between genetic similarity and geographic distance (R xy  = 0.31, P = 0.23). The analyses showed a low genetic differentiation (G ST  = 0.026) between the populations defined by a host and AMOVA analysis, most of the genetic variance (99.56 %) was attributed to differences within populations. In addition, based on the index of association (IA), the random mating possibility was not rejected (IA = 0.225, P = 0.123) for the population of H. vastatrix derived from C. canephora. This result suggested that H. vastatrix in Brazil behaves as a large undifferentiated population with a high level of genotypic diversity that is unstructured with regard to its geographic and host origins.
Palavras-chave: Coffee leaf rust
Durable resistance
Population genetics
Coffea arabica
Coffea canephora
Editor: Australasian Plant Pathology
Tipo de Acesso: Australasian Plant Pathology Society Inc. 2013
URI: https://doi.org/10.1007/s13313-013-0213-3
http://www.locus.ufv.br/handle/123456789/23100
Data do documento: Set-2013
Aparece nas coleções:Fitopatologia - Artigos

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