A second world-wide migration and population displacement of Phytophthora infestans? |
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| Authors: | L J SPIELMAN A DRENTH† L C DAVIDSE‡ L J SUJKOWSKI§ W GU P W TOOLEY¶ W E FRY |
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| Institution: | Department of Plant Pathology, Cornell University, Ithaca, New York, 14853, USA:;Department of Phytopathology, Wageningen Agricultural University, 6700 EE Wageningen, The Netherlands;Biotech Center Royal Sluis, PO Box 22. 1600 AA Enkhuizen, The Netherlands:;Institute for Potato Research. Mlochow, 05-832 Rozalin, Poland;;USDA-ARS. Ft. Detrick Bldg. 1301, Frederick. Maryland 21701, USA |
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| Abstract: | The appearance of the A2 mating type (previously restricted to central Mexico) in Europe during the 1980s prompted an investigation of the genetic make-up of European populations using allozyme loci as genetic markers. The investigation shows that major genetic changes have occurred in populations of Phytophthora infestans in the Netherlands, Poland, and the British Isles. It now appears that a new type of population has been introduced into several locations, and has displaced or is displacing the original populations in these locations. The new and old population types are characterized by unique allozyme alleles and genotypes. The mechanism for displacement of the'old'by the'new'population is not yet known. |
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