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Pathogenicity, morphology and genetic variation of Phytophthora cactorum from strawberry, apple, rhododendron, and silver birch

Published online by Cambridge University Press:  03 November 2000

Jarkko HANTULA ,
Arja LILJA ,
Heikki NUORTEVA ,
Päivi PARIKKA  and
Sabine WERRES
Jarkko HANTULA
Affiliation:
Finnish Forest Research Institute, Vantaa Research Centre, P.O. Box 18, FIN-01301 Vantaa, Finland.
Arja LILJA
Affiliation:
Finnish Forest Research Institute, Vantaa Research Centre, P.O. Box 18, FIN-01301 Vantaa, Finland.
Heikki NUORTEVA
Affiliation:
Finnish Forest Research Institute, Vantaa Research Centre, P.O. Box 18, FIN-01301 Vantaa, Finland.
Päivi PARIKKA
Affiliation:
Agricultural Research Centre, Institute of Plant Protection, FIN-31600 Jokioinen, Finland.
Sabine WERRES
Affiliation:
Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Protection in Horticultural Crops, Messeweg 11/12, D-38104 Braunschweig, Germany.
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Abstract

The analysis of random amplified microsatellite (RAMS) markers of Phytophthora cactorum from strawberry showed that leather rot of strawberry fruits and crown rot are not caused by genetically different strains of this species. UPGMA-analysis showed that the populations of P. cactorum on strawberry differ between North America and Europe and that no clear genetic separation between isolates from different plants can be made among these populations. Slight morphological variation exists in the diameters of oogonia and oospores among the isolates but is insufficient for the identification of genetic groups or host specificity of P. cactorum isolates. Pathogenicity experiments proved that strains show a tendency towards host specialization.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 9 , September 2000 , pp. 1062 - 1068
Copyright
© The British Mycological Society 2000

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