期刊
FUNGAL BIOLOGY
卷 122, 期 1, 页码 1-18出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2017.09.006
关键词
Corticioid fungi; Ericoid mycorrhizal fungi; Heterotachy; Hyphoderma argillaceum; Incongruence
类别
资金
- Ministry of Education, Youth and Sports of the Czech Republic [LO1509]
- Charles University, from the European Regional Development Fund in the Czech Republic [CZ.1.05/1.1.00/02.0109]
- Institute of Botany CAS [RVO 67985939]
- Faculty of Science, Charles University [MSMT LO1417]
- Ministry of Education, Youth and Sports of the Czech Republic from the European Regional Development Fund in the Czech Republic [CZ.1.07/2.3.00/30.0003]
- BIOCEV - Biotechnology and Biomedicine Centre of the Academy of Sciences from the European Regional Development Fund in the Czech Republic
The nuclear ribosomal DNA (nuc-rDNA) is widely used for the identification and phylogenetic reconstruction of Agaricomycetes. However, nuc-rDNA-based phylogenies may sometimes be in conflict with phylogenetic relationships derived from protein coding genes. In this study, the taxonomic position of the basidiomycetous mycobiont that forms the recently discovered sheathed ericoid mycorrhiza was investigated, because its nuc-rDNA is highly dissimilar to any other available fungal sequences in terms of nucleotide composition and length, and its nuc-rDNA-based phylogeny is inconclusive and significantly disagrees with protein coding sequences and morphological data. In the present work, this mycobiont was identified as Kurtia argillacea (= Hyphoderma argillaceum) residing in the order Hymenochaetales (Basidiomycota). Bioinformatic screening of the Kurtia ribosomal DNA sequence indicates that it represents a gene with a non-standard substitution rate or nucleotide composition heterogeneity rather than a deep paralogue or a pseudo gene. Such a phenomenon probably also occurs in other lineages of the Fungi and should be taken into consideration when nuc-rDNA (especially that with unusual nucleotide composition) is used as a sole marker for phylogenetic reconstructions. Kurtia argillacea so far represents the only confirmed non-sebacinoid ericoid mycorrhizal fungus in the Basidiomycota and its intriguing placement among mostly saprobic and parasitic Hymenochaetales begs further investigation of its eco-physiology. (C) 2017 British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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