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Genetic variation between Phytophthora cactorum isolates differing in their ability to cause crown rot in strawberry

Published online by Cambridge University Press:  05 May 2004

Håvard EIKEMO ,
Sonja S. KLEMSDAL ,
Ingvild RIISBERG ,
Peter BONANTS ,
Arne STENSVAND  and
Anne M. TRONSMO
Håvard EIKEMO
Affiliation:
The Norwegian Crop Research Institute, Plant Protection Centre, Høgskoleveien 7, N-1432 Aas, Norway. E-mail: haavard.eikemo@planteforsk.no
Sonja S. KLEMSDAL
Affiliation:
The Norwegian Crop Research Institute, Plant Protection Centre, Høgskoleveien 7, N-1432 Aas, Norway. E-mail: haavard.eikemo@planteforsk.no
Ingvild RIISBERG
Affiliation:
The Norwegian Crop Research Institute, Plant Protection Centre, Høgskoleveien 7, N-1432 Aas, Norway. E-mail: haavard.eikemo@planteforsk.no
Peter BONANTS
Affiliation:
Plant Research International, P. O. Box 16, 6700 AA Wageningen, The Netherlands.
Arne STENSVAND
Affiliation:
The Norwegian Crop Research Institute, Plant Protection Centre, Høgskoleveien 7, N-1432 Aas, Norway. E-mail: haavard.eikemo@planteforsk.no
Anne M. TRONSMO
Affiliation:
The Norwegian Crop Research Institute, Plant Protection Centre, Høgskoleveien 7, N-1432 Aas, Norway. E-mail: haavard.eikemo@planteforsk.no
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Abstract

Analysis of 44 isolates of Phytophthora cactorum, isolated from strawberry and other hosts, by AFLP showed that the crown rot pathotype is different from leather rot isolates and from P. cactorum isolated from other hosts. 16 of 23 crown rot isolates, including isolates from Europe, Japan, Australia, and New Zealand, were identical in an analysis based on 96 polymorphic bands from seven primer combinations. Leather rot isolates of strawberry could not be distinguished from isolates from other hosts. The pathogenicity test of all 44 isolates on strawberry plants mostly gave unambiguous results, except for three American isolates, which seemed to have reduced aggressiveness compared to the crown rot isolates. These isolates also differed in the AFLP analysis. Comparing information on the origin of the isolates with results from the pathogenicity test, showed that isolates from strawberry fruits or petioles could be either leather rot or crown rot pathotypes. None of the isolates from hosts other than strawberry caused crown rot symptoms in strawberry.

Type
Research Article
Information
Mycological Research , Volume 108 , Issue 3 , March 2004 , pp. 317 - 324
Copyright
© The British Mycological Society 2004

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