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- Title
<em>Phytophthora infestans</em> in Poland from 1987-1989; Nuclear DNA Content, Mating Type Distribution and Response to Metalaxyl.
- Authors
Therrien, C. D.; Ritch, D. L.; Sujkowski, L. S.; Spielman, L. J.; Fry, W. E.; Daggett, S. S.; Sim, J. H.; Tooley, P. W.
- Abstract
Isolates of <em>Phytophthora infestans</em> were collected from all potato growing regions of Poland during the blight seasons of 1987-1989. All 1987 isolates were of Al mating type and were sensitive to metalaxyl. In 1988 and 1989, 46.5% and 55.3% of the isolates were sensitive to metalaxyl, respectively. The percentage of highly resistant (R) isolates increased from 25.6% in 1988 to 39.5 % in 1989; however the percentage of intermediately resistant (J) isolates decreased during that period from 27.9% to 5.3 %. A significant association was observed between the Al compatibility type and metalaxyl resistance. The A2 mating type first appeared in 1988, and its frequency increased from 4.7 % of the population in 1988 to 47.6% in 1989. Coincident with this change in mating type frequency, changes in ploidy levels of isolates were observed. Whereas 3% of the 1988 isolates were diploid, 90% of the 1989 A2 isolates and 28.6% of the 1989 A1 isolates were diploid. The approximate 1:1 ratio of the two mating types encountered in 1989, and the predominance of diploidy, indicates that the Polish population of <em>P. infestans</em> has the potential to become sexual.
- Subjects
POLAND; PHYTOPHTHORA; POTATOES; PYTHIACEAE; SEASONS; ASTRONOMICAL geography; PHYTOPHTHORA cinnamomi
- Publication
Journal of Phytopathology, 1993, Vol 139, Issue 1, p68
- ISSN
0931-1785
- Publication type
Article
- DOI
10.1111/j.1439-0434.1993.tb01402.x