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Identification of two powdery mildew fungi, Oidium neolycopersici sp. nov. and O. lycopersici, infecting tomato in different parts of the world

Published online by Cambridge University Press:  12 July 2001

Levente KISS ,
Roger T. A. COOK ,
Gregory S. SAENZ ,
James H. CUNNINGTON ,
Susumu TAKAMATSU ,
Ian PASCOE ,
Marc BARDIN ,
Philippe C. NICOT ,
Y. SATO  and
Amy Y. ROSSMAN
Levente KISS
Affiliation:
Plant Protection Institute, Hungarian Academy of Sciences, P.O. Box 102, H-1525 Budapest, Hungary E-mail: lkiss@nki.hu
Roger T. A. COOK
Affiliation:
Central Science Laboratory, Ministry of Agriculture Fisheries and Food, York YO41 1LZ, UK
Gregory S. SAENZ
Affiliation:
Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA
James H. CUNNINGTON
Affiliation:
Department of Applied Biology/Biotechnology, RMIT University, Melbourne 3001, Australia
Susumu TAKAMATSU
Affiliation:
Faculty of Bioresources, Mie University, Tsu 514-8507, Japan
Ian PASCOE
Affiliation:
Institute for Horticultural Development, Victoria 3176, Australia
Marc BARDIN
Affiliation:
INRA, Unité de Pathologie Végétale, B.P. 94, 84143 Montfavet cedex, France
Philippe C. NICOT
Affiliation:
INRA, Unité de Pathologie Végétale, B.P. 94, 84143 Montfavet cedex, France
Y. SATO
Affiliation:
College of Technology, Toyama Prefectural University, Toyama 939-0398, Japan
Amy Y. ROSSMAN
Affiliation:
USDA-ARS, Systematic Botany & Mycology Laboratory, Beltsville, MD 20705, USA.
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Abstract

A world-wide study of the Oidium species causing economic damage on tomato has identified two taxa using classical morphological, scanning electron microscope (SEM) and molecular phylogenetic analyses. The material consisted of a total of 25 tomato powdery mildew isolates and 29 herbarium specimens coming from all continents where tomatoes are grown. A taxon with non-catenate conidia widespread in Europe, Africa, North and South America and Asia was identified as an O. subgen. Pseudoidium species (teleomorph: Erysiphe sect. Erysiphe). Formerly mistaken for O. lycopersicum (or O. lycopersici), it is now recognised as a distinct species, O. neolycopersici sp. nov. A phylogenetic analysis of the internal transcribed spacer (ITS) sequences of the ribosomal DNA (rDNA) indicated that O. neolycopersici is closely related to Erysiphe macleayae, E. aquilegiae and other Pseudoidium species. Only a taxon with catenate conidia was found on Australian specimens. This was identified as a species of O. subgen. Reticuloidium (teleomorph: Golovinomyces sp.). Phylogenetic analysis of the rDNA ITS sequences showed that this species is closely related to O. longipes infecting eggplant. Because it is most likely to be the same species as the original O. lycopersicum, which was actually first described in Australia, this is here neotypified as O. lycopersici.

Type
Research Article
Information
Mycological Research , Volume 105 , Issue 6 , June 2001 , pp. 684 - 697
Copyright
© The British Mycological Society 2001

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