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Nuclear ribosomal sequence analysis of Oidiodendron: towards a redefinition of ecologically relevant species.
- Source :
-
The New phytologist [New Phytol] 2001 Mar; Vol. 149 (3), pp. 565-576. - Publication Year :
- 2001
-
Abstract
- • Nuclear ribosomal sequence analysis was performed to investigate delimitation of common Oidiodendron species comprising endomycorrhizal symbionts and close associates of ectomycorrhizal plants. • Neighbour-joining, maximum likelihood and parsimony analyses were used to compare 35 ribosomal DNA (internal transcribed spacer (ITS) and 5.8S) sequences (including sequences available in databases) from 15 putative species. • Oidiodendron citrinum formed a monophyletic group nested within O. maius, whereas O. tenuissimum and O. griseum did not appear either as distinct groups or as a single complex. Pairwise nucleotide divergence values between O. citrinum and O. maius were very low and comparable to intraspecific values obtained for both species; values for O. griseum and O. tenuissimum, although higher, overlapped those observed at the intraspecific level for the two species. • Molecular data indicate that O. maius and O. citrinum, which were described as distinct, though related species, could be moved to a subspecific level; however, the delimitation of O. griseum and O. tenuissimum is still open to question. Taxonomic rank assignment to groups determined from sequence data analysis is discussed.
Details
- Language :
- English
- ISSN :
- 1469-8137
- Volume :
- 149
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- The New phytologist
- Publication Type :
- Academic Journal
- Accession number :
- 33873341
- Full Text :
- https://doi.org/10.1046/j.1469-8137.2001.00058.x