Abstract
The genetic structure of a Plasmopara viticola population was characterized on five single vines, one for each cultivar Regent, Merlot, Isabella, Müller-Thurgau and Solaris, using four neutral specific polymorphic microsatellite markers. Five-hundred and seventy samples were collected at four dates in the period between the 10th of July and the 23rd of August 2006. On average over all five cultivars, 67% of the genotypes present on the single selected vines derived from primary infections and caused 37% of the lesions genotyped. Fifty-three percent of these genotypes occurred only once on the vine throughout the survey period, while 14% were able to asexually reproduce on the selected single vine throughout the survey period, causing 23% of the lesions. Thirty-three percent of the genotypes on the single vine derived from other vines, 28% from vines of other cultivars in the other rows, and 5% from vines of the same cultivar in the same row. New primary infections appear all along the sampling dates. The overwhelmingly quantitative role of primary infections at vineyard scale was known, however here we observed the phenomenon also at the single vine scale and the reduced contribution of secondary lesions to the populations present on more resistant cultivars compared to the susceptible cultivars. As the sampling extended almost to defoliation, the results are judged to be representative of a typical P. viticola epidemic.
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Acknowledgements
This work was supported by SBF 03.0485-1 (EU-Project 501542 REPCO). The authors gratefully acknowledge Rocchina Abbas-Pennella for helping with the laboratory work, Michele Gusberti and Natasha Rosselli for helping with the collection of samples and disease assessment, and Roberto Rigoni and Mirto Ferretti for the maintenance work in the vineyard.
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Matasci, C.L., Jermini, M., Gobbin, D. et al. Microsatellite based population structure of Plasmopara viticola at single vine scale. Eur J Plant Pathol 127, 501–508 (2010). https://doi.org/10.1007/s10658-010-9615-z
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DOI: https://doi.org/10.1007/s10658-010-9615-z