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Characterization of Aphanomyces invadans isolates using pyrolysis mass spectrometry (PyMS)

Lookup NU author(s): Dr Gordon Beakes


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Twenty-one isolates of Aphanomyces invadans, the fungal pathogen associated with the Asian fish disease epizootic ulcerative syndrome (EUS), were compared with other Oomycete fungi in terms of their pyrolysis mass spectrometry (PyMS) profiles. Canonical variate analysis (CVA) of the pyrolysis mass spectra distinguished the Aphanomyces species from a wide scatter of Achlya and Saprolegnia isolates. Further CVA and hierarchal cluster analysis (HCA) separated the Aphanomyces species into two main groups. The first group clustered A. invadans isolates from EUS outbreaks in Thailand, Bangladesh, Indonesia, Philippines, Australia and Japan together. However, HCA also included the crayfish plague fungus Aphanomyces astaci within this group. Non-pathogenic Aphanomyces strains isolated from ulcerative mycosis (UM)-affected fish were shown to be distinct from A. invadans, and instead clustered with saprophytic Aphanomyces strains to form the second group. Recently, an invasive Aphanomyces pathogen has been isolated from UM-affected fish, but that was not tested here. This is the first report using PyMS in the study of Oomycete systematics. The technique was not sensitive enough to show any intraspecific differences, but it was considered a useful technique for the discrimination of species where taxonomic relationships are uncertain.

Publication metadata

Author(s): Beakes GW; Lilley JH; Hetherington CS

Publication type: Article

Publication status: Published

Journal: Mycoses

Year: 2001

Volume: 44

Issue: 9-10

Pages: 383-389

ISSN (print): 0933-7407

ISSN (electronic): 1439-0507

Publisher: Wiley-Blackwell Verlag GmbH


DOI: 10.1046/j.1439-0507.2001.00668.x

PubMed id: 11766103


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