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Molecular Identification of Oidium neolycopersicias the Causal Agent of the Recent Tomato Powdery Mildew Epidemics in North America

Kiss, Levente and Takamatsu, Susumu and Cunnington, James H. (2005) Molecular Identification of Oidium neolycopersicias the Causal Agent of the Recent Tomato Powdery Mildew Epidemics in North America. Plant Disease, 89 (5). pp. 491-496. ISSN 0191-2917

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Abstract

A previous morphological study of Oidium anamorphs responsible for the recent tomato (Lycopersicon esculentum) powdery mildew outbreaks worldwide suggested that, despite controversial data in the literature, the North American epidemics were caused solely by a newly erected species, O. neolycopersici. We report here the first molecular evidence that the North American anamorphs do belong to O. neolycopersici. The internal transcribed spacer sequences of the North American anamorphs of this study were identical with those of three Japanese and four European specimens of O. neolycopersici. A morphological study confirmed that all the North American Oidium anamorphs included in this study produced conidia singly, similar to O. neolycopersici. These fungi were readily distinguished from O. lycopersici, which produces conidia in chains and is known to infect tomato only in Australia. The phylogenetic analysis showed that O. neolycopersici is a distinct powdery mildew species, and it is neither identical nor closely related to any known polyphagous species of the Erysiphaceae. Apparently, it was introduced into the United States and Canada only in the 1990s, but its origin is still unknown.

Item Type: Article
Subjects: Q Science / természettudomány > QK Botany / növénytan
Depositing User: Erika Bilicsi
Date Deposited: 05 Apr 2013 11:03
Last Modified: 05 Apr 2013 11:03
URI: http://real.mtak.hu/id/eprint/4625

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