Population studies on <Emphasis Type="Italic">Phytophthora infestans</Emphasis> on potatoes and tomatoes in southern Germany |
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| Authors: | K Möller M Dilger J Habermeyer V Zinkernagel W G Flier H Hausladen |
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| Institution: | 1.Lehrstuhl für Phytopathologie,Technische Universit?t München,Freising,Germany;2.Plant Research International,Wageningen,The Netherlands |
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| Abstract: | Fifty-seven isolates of Phytophthora infestans from blighted potato foliage were collected in 1995 in southern Germany and analysed for mating type and sensitivity to metalaxyl.
Fifty-six of them were characterised as A1 and one as A2 mating types. Resistance to metalaxyl was observed frequently: 53
isolates were resistant, three were partially sensitive, and one was sensitive. In a subsequent field study in 1999, 84 isolates
collected from blighted potato and tomato foliage were analysed for mating type. Seventy-two were characterised as A1 and
twelve as A2 mating types. The response of 76 isolates to metalaxyl and to propamocarb was tested. The majority (42) of the
76 isolates was classified as resistant to metalaxyl; 31 were partially sensitive and only three isolates were sensitive.
The results with propamocarb were less discrete; 10 isolates were classified as resistant and three were clearly sensitive.
AFLP fingerprinting was used to examine the genetic structure of the southern German P. infestans population collected in 1999 and indicated that the tested population can be sub-divided into a tomato group, a potato group
and a mixed group containing isolates collected from both crops. The presence of Ia and IIa mitochondrial DNA haplotypes indicates
that the German P. infestans isolates belong to the new pathogen population that has also been reported in neighbouring regions of Europe. The present
study indicates that at the beginning of the season only a few genotypes were present, and the population became genetically
more variable at the end of the growing season. |
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| Keywords: | DNA fingerprinting Fungicide sensitivity Mating type Metalaxyl mtDNA haplotype Propamocarb |
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