Phylogenetic relationships and convergence of helicosporous fungi inferred from ribosomal DNA sequences

Molecular Phylogenetics and Evolution
C K M Tsui, M L Berbee

Abstract

Helicosporous fungi form elegant, coiled, and multicellular mitotic spores (conidia). In this paper, we investigate the phylogenetic relationships among helicosporous fungi in the asexual genera Helicoma, Helicomyces, Helicosporium, Helicodendron, Helicoon, and in the sexual genus Tubeufia (Tubeufiaceae, Dothideomycetes, and Ascomycota). We generated ribosomal small subunit and partial large subunit sequences from 39 fungal cultures. These and related sequences from GenBank were analyzed using parsimony, likelihood, and Bayesian analysis. Results showed that helicosporous species arose convergently from six lineages of fungi in the Ascomycota. The Tubeufiaceae s. str. formed a strongly supported monophyletic lineage comprising most species from Helicoma, Helicomyces, and Helicosporium. However, within the Tubeufiaceae, none of the asexual genera were monophyletic. Traditional generic characters, such as whether conidiophores were conspicuous or reduced, the thickness of the conidial filament, and whether or not conidia were hygroscopic, were more useful for species delimitation than for predicting higher level relationships. In spite of their distinctive, barrel-shaped spores, Helicoon species were polyphyletic and had evolved ...Continue Reading

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Citations

Feb 20, 2010·Studies in Mycology·C L SchochJ W Spatafora
Feb 20, 2010·Studies in Mycology·C A ShearerY Zhang
Feb 20, 2010·Studies in Mycology·S SuetrongE B G Jones
Jun 9, 2010·Mycologia·Kazuyuki HirayamaCarol A Shearer
Mar 19, 2011·Mycologia·Astrid FerrerCarol A Shearer
Aug 22, 2017·IMA Fungus·Joey Tanney, Andrew N Miller
May 28, 2019·Frontiers in Microbiology·Monika C DayarathneRui Lin Zhao
Jun 20, 2017·Studies in Mycology·M Hernández-RestrepoJ Guarro

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