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Mycologia, 96(6), 2004, pp. 1316-1329.
© 2004 by The Mycological Society of America

Tuberculina-Helicobasidium: Host specificity of the Tuberculina-stage reveals unexpected diversity within the group1


Matthias Lutz 2
Robert Bauer
Dominik Begerow
Franz Oberwinkler

     Universität Tübingen, Botanisches Institut, Lehrstuhl Spezielle Botanik und Mykologie, Auf der Morgenstelle 1, D-72076 Tübingen, Germany

Tuberculina species are mitosporic parasites of rust fungi. It was demonstrated recently that Tuberculina represents the asexual life stage of the plant-parasitic genus Helicobasidium. Here we reveal the host specificities of Tuberculina and Helicobasidium species on rust fungal hosts by means of infection experiments and molecular analyses. We inoculated species of the rust genera Chrysomyxa, Coleosporium, Cronartium, Gymnosporangium, Puccinia, Tranzschelia and Uromyces with conidia and with basidiospores of Helicobasidium longisporum and H. purpureum and with conidia of Tuberculina maxima, T. persicina and T. sbrozzii. In addition we analyzed base sequences from the nuclear ITS region of 51 Tuberculina and Helicobasidium specimens collected in the field together with the sequences from the Tuberculina infections obtained by infection experiments. The resulting data show that at least six monophyletic lineages are within the Tuberculina/Helicobasidium-group that can be unambiguously distinguished by combining molecular and morphological characters and by specific host spectra of the Tuberculina-stage. This diversity opens up new vistas on the evolution of this exceptional mycoparasitic-phytoparasitic fungal group.

Key words: Helicobasidium, host specificity, infection experiments, ITS, Tuberculina, molecular phylogeny, mycoparasitism, Urediniomycetes




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Copyright © 2004 by The Mycological Society of America.