Pathogenic, morphological and genetic diversity in Plasmopara halstedii, the causal agent of sunflower downy mildew - doi: 10.4025/actasciagron.v35i1.15722

Autores

  • Nachaat Sakr Syrian Atomic Energy Commission Autor

DOI:

https://doi.org/10.4025/actasciagron.v35i1.15722

Palavras-chave:

aggressiveness, EST-derived markers, virulence, zoosporangia, sporangiophores

Resumo

Pathogenic, morphological and genetic variation was studied in 35 Plasmopara halstedii (sunflower downy mildew) isolates of different races. Virulence spectrum was analyzed in sunflower hybrids carrying effective Plgenes. Aggressiveness was analyzed in one sunflower inbred line showing a high level of quantitative resistance. There were differences in virulence spectrum for pathogen isolates. Index of aggressiveness was calculated for each isolate and two groups were revealed as more aggressive isolates of 100 and 3xx races, and less aggressive isolates of 7xx races. Significant morphological differences were found in zoosporangia and sporangiophores morphology. Genetic relationships were detected between the pathogen isolates using 12 EST-derived markers. Five multilocus genotypes (MLG) were identified among 35 P. halstedii isolates. Our results did not show a correlation between pathogen variation and both morphological and genetic characteristics.

 

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Biografia do Autor

  • Nachaat Sakr, Syrian Atomic Energy Commission
    Department of Agriculture, Syrian Atomic Energy Commission, Damascus, P.O. Box 6091, Syria Previous address INRA-UBP, UMR 1095, 234 Avenue du Brézet, 63100 Clermont-Ferrand, France.

Publicado

2012-08-27

Edição

Seção

Fitossanidade

Como Citar

Sakr, N. (2012). Pathogenic, morphological and genetic diversity in Plasmopara halstedii, the causal agent of sunflower downy mildew - doi: 10.4025/actasciagron.v35i1.15722. Acta Scientiarum. Agronomy, 35(1), 9-19. https://doi.org/10.4025/actasciagron.v35i1.15722

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