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Genetic Dissection of Plasmopara viticola Population from a Greek Vineyard in Two Consecutive Years

Rumbou, Artemis ; Gessler, Cesare

In: European Journal of Plant Pathology, 2004, vol. 110, no. 4, p. 379-392

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    Title
    • Genetic Dissection of Plasmopara viticola Population from a Greek Vineyard in Two Consecutive Years
    Author
    • Rumbou, Artemis. Phytomedicine/Pathology, Institute of Plant Sciences, Swiss Federal Institute of Technology, Universitätstr. 2/LFW-C27, CH-8092, Zürich, Switzerland
    • Gessler, Cesare. Phytomedicine/Pathology, Institute of Plant Sciences, Swiss Federal Institute of Technology, Universitätstr. 2/LFW-C27, CH-8092, Zürich, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:319508
    Summary
    Oilspots of the Plasmopara viticola population in a Greek vineyard over 2 years were collected and the pathogen genotyped with the use of four microsatellite loci. In 2001, five samplings occurred and 327 lesions were collected, which were classified to 23 genotypes. In 2002, the 426 lesions collected in four samplings belonged to 54 genotypes. A reproducible pattern of the evolution of the epidemic was exhibited that can be described as 'predominance-of-one-clone'. In 2001, the predominant clone covered 72-92% of each sample, while in 2002 the incidence of the predominant clone was 38-90%. The remaining genotypes showed low clonal reproduction and dispersal. Oosporic infections occurred throughout the season. The severity and the diversity in 2002 were, however, higher than in 2001 and this was not in accordance with the climatic conditions, suggesting that other factors, like the epidemic of the previous year, also influence the epidemic of the disease. These results produce new concepts about the epidemiology of the pathogen