A total of 123 isolates of Phytophthora infestans were recovered from 43 commercial fields and allotments of potato and tomato in Hungary. Isolates were characterised for mating type, response to metalaxyl, isozyme genotype at glucose-6-phosphate isomerase (Gpi) and peptidase A (Pep) loci, nuclear DNA fingerprint with probe RG57 and mitochondrial haplotype. Both mating types were detected in 8 potato and 3 tomato fields. The frequency of A1 and A2 were 47.5% and 52.5% on potato and 60.5% and 39.5% on tomato. More than sixty per cent of the whole population were resistant (31.1%) or responded intermediately (30.2%) to the fungicide metalaxyl in vitro. All isolates were monomorphic at the Gpi locus (100/100), but four allele combinations 100/100 (33%), 96/100 (28%), 96/96 (31%) and 83/96 (8%) were found at the Pep locus. Genotype Pep 83/96 is rare in Europe and all isolates with this allele combination were of A1 mating type and Ia mitochondrial haplotype. As in other European populations, only two of the four mitochondrial haplotypes (Ia, 32.5% and IIa, 67.5%) were detected. Diversity of RG57 fingerprints was high. Of the 79 different fingerprints found 67 were not detected previously.
Bakonyi, J., Heremans, B. and Jamart, G. (2002a): Characterization of Phytophthora infestans isolates collected from potato in Flanders, Belgium. J. Phytopathol. 150, 512-516.
'Characterization of Phytophthora infestans isolates collected from potato in Flanders, Belgium ' () 150 J. Phytopathol. : 512 -516.
Bakonyi, J., Láday, M., Dula, T. and Érsek, T. (1998): Characterization of Phytophthora infestans isolates from Hungary. Acta Phytopathol. Entomol. Hung. 33, 49-54.
'Characterization of Phytophthora infestans isolates from Hungary ' () 33 Acta Phytopathol. Entomol. Hung. : 49 -54.
Bakonyi, J., Láday, M., Dula, T. and Érsek, T. (2002b): Characterisation of isolates of Phytophthora infestans from Hungary. Eur. J. Plant Pathol. 108, 139-146.
'Characterisation of isolates of Phytophthora infestans from Hungary ' () 108 Eur. J. Plant Pathol. : 139 -146.
Anonym (1995): The DIG System Users' Guide for Filter Hybridization. Boehringer Mannheim GmbH Biochemica.
'The DIG System Users' Guide for Filter Hybridization ' () Boehringer Mannheim GmbH Biochemica. .
Bakonyi, J. and Érsek, T. (1997): First report of the A2 mating type of Phytophthora infestans on potato in Hungary. Plant Dis. 81, 1094.
'First report of the A2 mating type of Phytophthora infestans on potato in Hungary ' () 81 Plant Dis. : 1094.
Murray, M. G. and Thompson, W. F. (1980): Rapid isolation of high molecular weight plant DNA. Nucl. Acids Res. 8, 4321-4325.
'Rapid isolation of high molecular weight plant DNA ' () 8 Nucl. Acids Res. : 4321 -4325.
Brurberg, M. B., Hannukkala, A. and Hermansen, A. (1999): Genetic variability of Phytophthora infestans in Norway and Finland as revealed by mating type and fingerprint probe RG57. Mycol. Res. 103, 1609-1615.
'Genetic variability of Phytophthora infestans in Norway and Finland as revealed by mating type and fingerprint probe RG57 ' () 103 Mycol. Res. : 1609 -1615.
Carlisle, D. J., Cooke, D. L. and Brown, A. E. (2001): Phenotypic and genotypic characterisation of Northern Ireland isolates of Phytophthora infestans. Eur. J. Plant Pathol. 107, 291-303.
'Phenotypic and genotypic characterisation of Northern Ireland isolates of Phytophthora infestans ' () 107 Eur. J. Plant Pathol. : 291 -303.
Cooke, L. R., Carlisle, D. J., Wilson, D. G. and Deahl, K. L. (2002): Natural occurrence of Phytophthora infestans on woody nightshade (Solanum dulcamara) in Ireland. Plant Pathol. 51, 392.
'Natural occurrence of Phytophthora infestans on woody nightshade (Solanum dulcamara) in Ireland ' () 51 Plant Pathol. : 392.
Daggett, S. S., Götz, E. and Therrien, C. D. (1993): Phenotypic changes in populations of Phytophthora infestans from Eastern Germany. Phytopathology 83, 319-323.
'Phenotypic changes in populations of Phytophthora infestans from Eastern Germany ' () 83 Phytopathology : 319 -323.
Day, J. P., Wattier, R. A. M., Shaw, D. S. and Shattock, R. C. (2004): Phenotypic and genotypic diversity in Phytophthora infestans on potato in Great Britain, 1995-98. Plant Pathol. 53, 303-315.
'Phenotypic and genotypic diversity in Phytophthora infestans on potato in Great Britain, 1995-98 ' () 53 Plant Pathol. : 303 -315.
Érsek, T. and Bakonyi, J. (1997): Potato late blight: the disease and the pathogen. Növényvédelem 33, 353-382. (In Hungarian with English summary.)
'Potato late blight: the disease and the pathogen ' () 33 Növényvédelem : 353 -382.
Goodwin, S. B., Drenth, A. and Fry, W. E. (1992a): Cloning and genetic analyses of two highly polymorphic, moderately repetitive nuclear DNAs from Phytophthora infestans. Curr. Genet. 22, 107-115.
'Cloning and genetic analyses of two highly polymorphic, moderately repetitive nuclear DNAs from Phytophthora infestans ' () 22 Curr. Genet. : 107 -115.
Goodwin, S. B., Schneider, R. E. and Fry, W. E. (1995): Use of cellulose acetate electrophoresis for rapid identification of allozyme genotypes of Phytophthora infestans. Plant Dis. 79, 1181-1185.
'Use of cellulose acetate electrophoresis for rapid identification of allozyme genotypes of Phytophthora infestans ' () 79 Plant Dis. : 1181 -1185.
Goodwin, S. B., Spielman, L. J., Matuszak, J. M., Bergeron, S. N. and Fry, W. E. (1992b): Clonal diversity and genetic differentiation of Phytophthora infestans populations in Northern and Central Mexico. Phytopathology 82, 955-956.
'Clonal diversity and genetic differentiation of Phytophthora infestans populations in Northern and Central Mexico ' () 82 Phytopathology : 955 -956.
Griffith, G. W. and Shaw, D. S. (1998): Polymorphisms in Phytophthora infestans: Four mitochondrial haplotype are detected after PCR amplification of DNA from pure cultures or from host lesions. Appl. Environ. Microbiol. 64, 4007-4014.
'Polymorphisms in Phytophthora infestans: Four mitochondrial haplotype are detected after PCR amplification of DNA from pure cultures or from host lesions ' () 64 Appl. Environ. Microbiol. : 4007 -4014.
Hebert, P. D. N. and Beaton, M. J. (1993): Methodologies for Allozyme Analysis Using Cellulose Acetate Electrophoresis. A Practical Handbook. Helena Laboratories, Beaumont, TX.
Methodologies for Allozyme Analysis Using Cellulose Acetate Electrophoresis. A Practical Handbook , ().
Hohl, H. R. and Iselin, K. (1984): Strains of Phytophthora infestans from Switzerland with A2 mating type behaviour. Trans. Br. Mycol. Soc. 83, 529-530.
'Strains of Phytophthora infestans from Switzerland with A2 mating type behaviour ' () 83 Trans. Br. Mycol. Soc. : 529 -530.
Hutcheson, K. (1970): A test for comparing diversities based on the Shannon formula. J. Theor. Biol. 29, 151-154.
'A test for comparing diversities based on the Shannon formula ' () 29 J. Theor. Biol. : 151 -154.
Láday, M., Bagi, F., Mesterházy, Á. and Szécsi Á. (2000): Isozyme evidence for two groups of Fusarium graminearum. Mycol. Res. 104, 788-793.
'Isozyme evidence for two groups of Fusarium graminearum ' () 104 Mycol. Res. : 788 -793.
Lebreton, L. and Andrivon, D. (1998): French isolates of Phytophthora infestans from potato and tomato differ in phenotype and genotype. Eur. J. Plant Pathol. 104: 583-594.
'French isolates of Phytophthora infestans from potato and tomato differ in phenotype and genotype ' () 104 Eur. J. Plant Pathol. : 583 -594.
McLeod, A., Denman, S., Sadie, A. and Denner, F. D. N. (2001): Characterization of South-African isolates of Phytophthora infestans. Plant Dis. 85, 287-289.
'Characterization of South-African isolates of Phytophthora infestans ' () 85 Plant Dis. : 287 -289.
Mudich, A. (1965): Biotypes of Phytophthora infestans in southern Transdanubia, Hungary. Növényvédelem 1, 27-32. (In Hungarian.)
'Biotypes of Phytophthora infestans in southern Transdanubia, Hungary ' () 1 Növényvédelem : 27 -32.
Nagy, Z. Á., Bakonyi, J. and Érsek, T. (2003): Novel genotypes in Phytophthora infestans population in Hungary. Acta Phytopathol. Entomol. Hung. 38, 7-11.
'Novel genotypes in Phytophthora infestans population in Hungary ' () 38 Acta Phytopathol. Entomol. Hung. : 7 -11.
Nei, M. (1973): Analysis of gene diversity in subdivided populations. Proc. Nat. Acad. Sci., USA 70, 3321-3323.
'Analysis of gene diversity in subdivided populations ' () 70 Proc. Nat. Acad. Sci., USA : 3321 -3323.
Nei, M. (1978): Estimation of average heterozygosity and genetic distance from a small number of individuals. Genetics 89, 583-590.
'Estimation of average heterozygosity and genetic distance from a small number of individuals ' () 89 Genetics : 583 -590.
Nei, M. and Chesser, R. K. (1983): Estimation of fixation indices and gene diversities. Ann. Hum. Gen. 47, 253-259.
'Estimation of fixation indices and gene diversities ' () 47 Ann. Hum. Gen. : 253 -259.
Niederhauser, J. S. (1991): Phytophthora infestans: The Mexican connection. In: Lucas, J. A., Shattock, R. C. and Cooke, L. R. (eds): Phytophthora. Cambridge Univesity Press, Cambridge, Great Britain.
Phytophthora infestans: The Mexican connection , ().
Sambrook, J., Fritsch, E. F. and Maniatis, T. (1989): Molecular Cloning: A Laboratory Manual, 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA.
Molecular Cloning: A Laboratory Manual , ().
Sedegui, M., Carroll, R. B., Morehart, A. L., Evans, T. A., Kim, S. H., Lakhdar, R. and Arifi, A. (2000): Genetic structure of the Phytophthora infestans population in Morocco. Plant Dis. 84, 173-176.
'Genetic structure of the Phytophthora infestans population in Morocco ' () 84 Plant Dis. : 173 -176.
Shattock, R. C., Shaw, D. S., Fyfe, A. M., Dunn, J. R., Loney, K. H. and Shattock, J. A. (1990): Phenotypes of Phytophthora infestans collected in England and Wales from 1985 to 1988: mating type, response to metalaxyl and isoenzyme analysis. Plant Pathol. 39, 242-248.
'Phenotypes of Phytophthora infestans collected in England and Wales from 1985 to 1988: mating type, response to metalaxyl and isoenzyme analysis ' () 39 Plant Pathol. : 242 -248.
Sigler, W. V. and Zeyer, J. (2002): Microbial diversity and activity along the forefields of two receding glaciers. Microbiol. Ecol. 43, 397-407.
'Microbial diversity and activity along the forefields of two receding glaciers ' () 43 Microbiol. Ecol. : 397 -407.
Forbes, G. A., Goodwin, S. B., Drenth, A., Oyarzun, P., Ordoŝez, M. E. and Fry, W. E. (1998): A global marker database for Phytophthora infestans. Plant Dis. 82, 811-818.
'A global marker database for Phytophthora infestans ' () 82 Plant Dis. : 811 -818.
Fry, W. E. and Goodwin, S. B. (1995): Recent migrations of Phytophthora infestans. In: Dowley, L. J., Bannon, E., Cooke, L. R., Keane, T. and O'Sullivan, E. (eds): Phytophthora infestans 150. Boole Press Ltd. Dublin, Ireland. pp. 89-95.
Recent migrations of Phytophthora infestans , () 89 -95.
Fry, W. E., Goodwin, S. B., Dyer, A. T., Matuszak, J. M., Drenth, A., Tooley, P. W., Sujkowski, L. S., Koh, Y. J., Cohen, B. A., Spielman, L. J., Deahl, K. L., Inglis, D. A. and Sandlan, K. P. (1993): Historical and recent migrations of Phytophthora infestans: chronology, pathways, and implications. Plant Dis. 77, 653-661.
'Historical and recent migrations of Phytophthora infestans: chronology, pathways, and implications ' () 77 Plant Dis. : 653 -661.
Goodwin, S. B. (1997): The population genetics of Phytophthora. Phytopathology 87, 462-473.
'The population genetics of Phytophthora ' () 87 Phytopathology : 462 -473.
Som, V., Nagy, Z. Á. Bakonyi, J. and Érsek, T. (2004): Mitochondrial DNA haplotypes in Phytophthora infestans populations of Hungary. Növényvédelem 40, 393-400. (In Hungarian with English summary.)
'Mitochondrial DNA haplotypes in Phytophthora infestans populations of Hungary ' () 40 Növényvédelem : 393 -400.
Spielman, L. J., Drenth, A., Davidse, L. C., Sujkowski, L. S., Gu, W. K., Tooley, P. W. and Fry, W. E. (1991): A second world-wide migration and population displacement of Phytophthora infestans? Plant Pathol. 40, 422-430.
'A second world-wide migration and population displacement of Phytophthora infestans? ' () 40 Plant Pathol. : 422 -430.
Sujkowski, L. S., Goodwin, S. B., Dyer, A. T. and Fry, W. E. (1994): Increased genotypic diversity via migration and possible occurrence of sexual reproduction of Phytophthora infestans in Poland. Phytopathology 84, 201-207.
'Increased genotypic diversity via migration and possible occurrence of sexual reproduction of Phytophthora infestans in Poland ' () 84 Phytopathology : 201 -207.
Yeh, F. C., Yang, R-C., Boyle, T. B. J., Ye, Z-H. and Mao, J. X. (1997): POPGENE, the user-friendly shareware for population genetic analysis. Alberta, Canada: University of Alberta, Canada, Molecular Biology and Biotechnology Centre.
POPGENE, the user-friendly shareware for population genetic analysis , ().
Zwankhuizen, M. J., Govers, F. and Zadoks, J. C. (2000): Inoculum sources and genotypic diversity of Phytophthora infestans in Southern Flevoland, the Netherlands. Eur. J. Plant. Pathol. 106, 667-680.
'Inoculum sources and genotypic diversity of Phytophthora infestans in Southern Flevoland, the Netherlands ' () 106 Eur. J. Plant. Pathol. : 667 -680.
Jaime-Garcia, R., Trinidad-Correa, R., Felix-Gastelum, R., Orum, T. V., Wassmann, C. C. and Nelson, M. R. (2000): Temporal and spatial patterns of genetic structure of Phytophthora infestans from tomato and potato in the Del Fuerte Valley. Phytopathology 90, 1188-1095.
'Temporal and spatial patterns of genetic structure of Phytophthora infestans from tomato and potato in the Del Fuerte Valley ' () 90 Phytopathology : 1188 -1095.
Koh, Y. J., Goodwin, S. B., Dyer, A. T., Cohen, B. A., Ogoshi, A., Sato, N. and Fry, W. E. (1994): Migration and displacements of Phytophthora infestans in East Asian Countries. Phytopathology 84, 922-927.
'Migration and displacements of Phytophthora infestans in East Asian Countries ' () 84 Phytopathology : 922 -927.