Do geographical barriers play any role in isolation of powdery mildew populations?
2004
Slovakova, T.,Comenius Univ., Bratislava (Slovak Republic). Faculty of Natural Sciences, Dept. of Plant Physiology, Mlynska dolina, SK-842 15 Bratislava | Svec, M.,Comenius Univ., Bratislava (Slovak Republic). Faculty of Natural Sciences, Dept. of Genetics | Miklovicova, M.
It has been supposed that wheat powdery mildew populations (Blumeria graminis f. sp. tritici) in Dobra Voda and Turiec Valley [Central Slovakia] may be isolated from other mildew populations by geographical barriers surrounding them. Mildew isolates were obtained from exposed trap plants in mobile and static nurseries (Dobra Voda). The single colony isolates were subsequently tested on detached leaves of seedlings of sets of differential wheat cultivars/lines with known specific resistance genes. Virulence frequencies in the mildew populations from Dobra Voda and Turiec Valley were compared to virulence frequencies from their neighbouring regions. Euclidian distances agreed with geographical distances in populations from Dobra Voda and its neighbouring populations. Cluster analysis has repeatedly proved that mildew population from Turiec Valley belongs to a separate cluster. Differences in virulence frequencies between these clusters were not significant, however, mildew population from Turiec Valley is considered to be different. Geographical barriers, mountains surrounding Dobra Voda and Turiec Valley, do not maintain any significant isolation for the migration of the pathogen spores on prevailing winds, even though the spread of the similar host genotypes within Slovakia and Europe makes the study of geographical isolation more difficult.
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