Genetic diversity and structure for virulence of three southern Brazilian Puccinia coronata f. sp. avenae Fraser & Led population

Genetic diversity and structure for virulence of three southern Brazilian Puccinia coronata f. sp. avenae Fraser & Led population

Studies on the genetic diversity and structure of pathogen populations by mean of known resistance genes are important as they allow the direct access to virulence/avirulence genes of individuals in target populations. Therefore, the goal of this work was to characterize the genetic diversity and st...

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Veröffentlicht in:Bragantia 2006-01, Vol.65 (1), p.147-155
Hauptverfasser: Vieira, Eduardo Alano, Carvalho, Fernando Iraja Felix De, Chaves, Marcia Soares
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Puccinia coronata
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description Studies on the genetic diversity and structure of pathogen populations by mean of known resistance genes are important as they allow the direct access to virulence/avirulence genes of individuals in target populations. Therefore, the goal of this work was to characterize the genetic diversity and structure of three Puccinia coronata f. sp avenae Fraser & Led populations from the State of Rio Grande do Sul by using a standard phenotypical assay of virulence/avirulence of 40 isolates to 25 Pcs genes. The results indicated that despite of the high variability for virulence of Southern brazilian isolates, the population showed a moderate genetic diversity, mainly as a function of the high virulence presented by the isolates. Basically, no difference was found in the frequency of virulence genes among the isolates collected in Capao do Leao, Eldorado do Sul and Passo Fundo counties, suggesting that the pathogen populations are not structured. The results indicated the need of a strategy for disease control in these three locations.
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title Genetic diversity and structure for virulence of three southern Brazilian Puccinia coronata f. sp. avenae Fraser & Led population
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