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Pathogenic, morphological and genetic diversity in Plasmopara halstedii, the causal agent of sunflower downy mildew - doi: 10.4025/actasciagron.v35i1.15722 Agronomy
Sakr, Nachaat; Syrian Atomic Energy Commission.
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....
Palavras-chave: Aggressiveness; EST-derived markers; Virulence; Zoosporangia; Sporangiophores aggressiveness; EST-derived markers; Virulence; Zoosporangia; Sporangiophores.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/15722
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