Phytophthora infestans in a single field in southwest Sweden early in spring: symptoms, spatial distribution and genotypic variation |
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Authors: | A.-K. Widmark ,B. Andersson,A. Cassel-Lundhagen,M. Sandströ m, J. E. Yuen |
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Affiliation: | Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences (SLU), Uppsala, PO Box 7026, SE-75007 Uppsala;;Department of Ecology, SLU, PO Box 7044, SE-75007, Uppsala;and;Swedish Board of Agriculture, Plant Protection Centre, Uppsala, Dragarbrunnsg 35, SE-75320 Uppsala, Sweden |
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Abstract: | Sixty-eight isolates of Phytophthora infestans were collected from an early planted, fleece-protected potato field in southwest Sweden in May 2001. No infection was observed in the neighbouring fields. In the field investigated, infected plants were found in six discrete foci, with symptoms almost exclusively observed in the lower part of the canopy and numerous infections found on stems and on leaves touching the ground. The structure of the population was analysed based on mating type, mitochondrial haplotype and microsatellites (SSRs) as markers. Both mating types were present and haplotypes Ia and IIa were detected. Among 61 isolates analysed with microsatellite markers, 14 multilocus genotypes were distinguished based on six polymorphic loci. Out of the six foci, three included 3–5 genotypes each. There were unique genotypes in all foci, except two closely situated to each other. These findings strongly suggest that soilborne oosporic inoculum contributed significantly to initiate the late-blight epidemic in the investigated field. |
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Keywords: | mating type microsatellite markers mitochondrial haplotype oospores potato late blight soilborne inoculum |
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