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Genetic variation within Podosphaera tridactyla reveals a paraphyletic species complex with biological specialization towards specific Prunus subgenera

Published online by Cambridge University Press:  24 March 2005

James H. CUNNINGTON ,
Ann C. LAWRIE  and
Ian G. PASCOE
James H. CUNNINGTON
Affiliation:
Department of Primary Industries, Knoxfield Centre, Private Bag 15, Ferntree Gully Delivery Centre, Victoria 3156, Australia. Department of Biotechnology and Environmental Biology, RMIT University, PO Box 71, Bundoora, Victoria 3083, Australia. E-mail: james.cunnington@dpi.vic.gov.au
Ann C. LAWRIE
Affiliation:
Department of Biotechnology and Environmental Biology, RMIT University, PO Box 71, Bundoora, Victoria 3083, Australia. E-mail: james.cunnington@dpi.vic.gov.au
Ian G. PASCOE
Affiliation:
Department of Primary Industries, Knoxfield Centre, Private Bag 15, Ferntree Gully Delivery Centre, Victoria 3156, Australia.
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Abstract

Podosphaera tridactyla (Ascomycota: Erysiphales) is a morphologically variable species occurring on Prunus s. lat. In order to assess the genetic variation within this species, the rDNA ITS region was amplified from 29 specimens from a range of Prunus species collected in Australia, Switzerland, and Korea. RFLP analysis of the PCR products revealed six groups, and a comparison of sequences from representatives of these groups revealed three clades: Clade 1 contained all specimens from Prunus subgen. Prunus; Clade 2 specimens from a variety of Prunus subgenera, except subgen. Prunus, and Podosphaera longiseta was closely allied to this clade; and Clade 3 contained two specimens, from Japan and Korea. Phylogenetic analysis comparing P. tridactyla with of a range of Podosphaera species suggests that P. tridactyla is paraphyletic.

Type
Research Article
Information
Mycological Research , Volume 109 , Issue 3 , March 2005 , pp. 357 - 362
Copyright
© The British Mycological Society 2005

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