Phylogenetic Relationships in the Juncaceae Inferred from Nuclear Ribosomal DNA Internal Transcribed Spacer Sequence Data

2005 ◽  
Vol 166 (3) ◽  
pp. 397-413 ◽  
Author(s):  
Eric H. Roalson
Keyword(s):  
Ribosomal Dna ◽  
Phylogenetic Relationships ◽  
Internal Transcribed Spacer ◽  
Sequence Data ◽  
Nuclear Ribosomal Dna

PHYLOGENY OF HEDYCHIUM AND RELATED GENERA (ZINGIBERACEAE) BASED ON ITS SEQUENCE DATA

2000 ◽  
Vol 57 (2) ◽  
pp. 261-270 ◽  
Author(s):  
T. H. WOOD ◽  
W. M. WHITTEN ◽  
N. H. WILLIAMS
Keyword(s):  
Ribosomal Dna ◽  
Dna Sequences ◽  
Interspecific Hybrid ◽  
Internal Transcribed Spacer ◽  
Sequence Data ◽  
Cladistic Analysis ◽  
Monophyletic Group ◽  
Nuclear Ribosomal Dna ◽  
Its Sequence ◽  
Limited Sample

The phylogeny of Hedychium J. Koenig was estimated using sequence data of internal transcribed spacer regions 1 and 2 (ITS1, ITS2) and 5.8S nuclear ribosomal DNA. Sequences were determined for 29 taxa, one interspecific hybrid of Hedychium and one species in each of 16 other genera of Zingiberaceae representing tribes Hedychieae, Globbeae, Zingibereae and Alpinieae. Cladistic analysis of these data strongly supports the monophyly of Hedychium, but relationships to other genera are poorly supported. Within Hedychium, four major clades are moderately supported. These clades are also distinguishable on the basis of number of flowers per bract and distribution. Stahlianthus, Curcuma, and Hitchenia also form a strongly supported clade. Based on this limited sample, the currently defined tribes of Zingiberoideae are not monophyletic. The Asiatic genera form a monophyletic group within this broadly defined Hedychieae. The taxonomy and biogeography of Hedychium are reviewed.

Phylogenetic relationships of three tribes of cloacinine nematodes (Strongylida: Chabertiidae) from macropodid marsupials

2018 ◽  
Vol 93 (04) ◽  
pp. 486-493 ◽  
Author(s):  
N.B. Chilton ◽  
F. Huby-Chilton ◽  
A. Koehler ◽  
R.B. Gasser ◽  
I. Beveridge
Keyword(s):  
Ribosomal Dna ◽  
Phylogenetic Relationships ◽  
Sequence Data ◽  
Internal Transcribed Spacers ◽  
Nuclear Ribosomal Dna ◽  
Host Genus ◽  
Single Host

AbstractThe phylogenetic relationships of 42 species of cloacinine nematodes belonging to three tribes (Coronostrongylinea, Macropostrongylinea and Zoniolaiminea) were examined based on sequence data of the first and second internal transcribed spacers (ITS-1 and ITS-2) of the nuclear ribosomal DNA. All nematodes examined are parasites of Australian macropodid marsupials. None of the three nematode tribes was monophyletic. Paraphyly was also encountered in three genera: Papillostrongylus, Monilonema and Wallabinema. Species within the genus Thallostonema were limited to a single host genus (i.e. Thylogale), whereas species within the five principal genera (Coronostrongylus, Macropostrongylus, Popovastrongylus, Wallabinema and Zoniolaimus) were found to occur in multiple host genera. Potential modes of evolution among these nematodes are discussed.

Phylogenetic relationships in Dermocybe and related Cortinarius taxa based on nuclear ribosomal DNA internal transcribed spacers

1997 ◽  
Vol 75 (4) ◽  
pp. 519-532 ◽  
Author(s):  
Y. J. Liu ◽  
S. O. Rogers ◽  
Y. J. Liu ◽  
J. F. Ammirati
Keyword(s):  
Ribosomal Dna ◽  
Phylogenetic Relationships ◽  
Phylogenetic Trees ◽  
Sequence Data ◽  
Molecular Data ◽  
Internal Transcribed Spacers ◽  
Nuclear Ribosomal Dna ◽  
Herbarium Specimens ◽  
Data Reorganization ◽  
Taxonomic Groups

The genus Cortinarius Fr. (Cortinariaceae, Agaricales) is divided into four or more subgenera. Dermocybe (Fr.) Sacc. has been recognized as either a subgenus of Cortinarius or a separate genus, distinguished in part by the presence of various anthraquinonic pigments. Nucleotide sequences of ribosomal DNA 5.8S and internal transcribed spacers were used to investigate the phylogenetic relationships among species of Dermocybe and selected taxa from subgenera of Cortinarius. Sequence data from 47 herbarium specimens representing 31 taxa (28 species plus 3 varieties) of Dermocybe and Cortinarius were analyzed using parsimony, maximum likelihood, and neighbor joining. In general, molecular data support the morphological groupings of the taxa, although they more closely correspond to biochemical (anthraquinone and other) analyses. Phylogenetic trees showed that, while the sections Dermocybe and Malicoriae are monophyletic, and the concolorous or almost concolorous red species (section Sanguineae, such as D. sanguinea and relatives) together formed a coherent clade, the subgenus Dermocybe sensu lato itself is polyphyletic. Cortinarius californicus clusters with taxa in Cortinarius, subgenus Telamonia, section Armillati. Dermocybe olivaceopicta is more closely related to other subgenera of Cortinarius than to Dermocybe. Within the genus Cortinarius, certain of the subgenera may actually represent coherent genera. Of the subgenera examined, Telamonia, Phlegmacium, and possibly Sericeocybe appear to represent well defined taxonomic groupings. However, current assignments of taxa within Leprocybe and Myxacium were inconsistent with the molecular data. Reorganization of some taxa and taxonomic groups is suggested. Key words: Dermocybe, Cortinarius, molecular phylogeny, rDNA, ITS1, ITS2.

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