scholarly journals Phylogenetic relationships of land plants using mitochondrial small-subunit rDNA sequences

1999 ◽  
Vol 86 (3) ◽  
pp. 372-386 ◽  
Author(s):  
R. Joel Duff ◽  
Daniel L. Nickrent
Keyword(s):  
Phylogenetic Relationships ◽  
Small Subunit ◽  
Land Plants ◽  
Rdna Sequences ◽  
Small Subunit Rdna

On the phylogeny of Ophiostoma, Ceratocystis s.s., and Microascus, and relationships within Ophiostoma based on partial ribosomal DNA sequences

1993 ◽  
Vol 71 (9) ◽  
pp. 1249-1265 ◽  
Author(s):  
G. Hausner ◽  
J. Reid ◽  
G. R. Klassen
Keyword(s):  
Dna Sequences ◽  
Sequence Data ◽  
Large Subunit ◽  
Small Subunit ◽  
Data Set ◽  
Rdna Sequences ◽  
Morphological Criteria ◽  
Small Subunit Rdna ◽  
Rdna Sequence Data ◽  
Large Subunit Rdna

Phylogenetic analysis of partial rDNA sequences suggests that Ophiostoma should remain the sole genus of the Ophiostomataceae, and this should be the sole family within the Ophiostomatales, whereas Ceratocystis s.s. would be best disposed within the Microascales. Although morphological criteria suggest that the genus Ophiostoma is heterogeneous, analysis of partial small subunit rDNA sequence data shows that Ophiostoma (excluding O. roraimense) represents a monophyletic taxon. Analysis of a partial large subunit rDNA data set, which included sequences from 55 species assignable to Ophiostoma, failed to support the strict subdivision of the genus based on either ascospore characters or the nature of the anamorph. Key words: Ceratocystis, Microascus, Ophiostoma, partial rDNA sequences, phylogeny.

Evolution of RuminantSarcocystis(Sporozoa) Parasites Based on Small Subunit rDNA Sequences

1999 ◽  
Vol 11 (1) ◽  
pp. 27-37 ◽  
Author(s):  
O.J.M. Holmdahl ◽  
David A. Morrison ◽  
John T. Ellis ◽  
Lam T.T. Huong
Keyword(s):  
Small Subunit ◽  
Rdna Sequences ◽  
Small Subunit Rdna

Molecular Phylogenetics of Ramaria and Related Genera: Evidence from Nuclear Large Subunit and Mitochondrial Small Subunit rDNA Sequences

Mycologia ◽  
2001 ◽  
Vol 93 (3) ◽  
pp. 465 ◽  
Author(s):  
Andrea J. Humpert ◽  
Eric L. Muench ◽  
Admir J. Giachini ◽  
Michael A. Castellano ◽  
Joseph W. Spatafora
Keyword(s):  
Molecular Phylogenetics ◽  
Large Subunit ◽  
Small Subunit ◽  
Rdna Sequences ◽  
Small Subunit Rdna

scholarly journals The endemic Cladophorales (Ulvophyceae) of ancient Lake Baikal represent a monophyletic group of very closely related but morphologically diverse species

2020 ◽  
Author(s):  
C Boedeker ◽  
F Leliaert ◽  
OA Timoshkin ◽  
VS Vishnyakov ◽  
S Díaz-Martínez ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Phylogenetic Signal ◽  
Small Subunit ◽  
Monophyletic Group ◽  
Species Flock ◽  
Surprising Result ◽  
Internal Transcribed Spacer Region ◽  
Rdna Sequences ◽  
Green Algal ◽  
Small Subunit Rdna

© 2018 Phycological Society of America Lake Baikal, the oldest lake in the world, is home to spectacular biodiversity and extraordinary levels of endemism. While many of the animal species flocks from Lake Baikal are famous examples of evolutionary radiations, the lake also includes a wide diversity of endemic algae that are not well investigated with regards to molecular-biological taxonomy and phylogeny. The endemic taxa of the green algal order Cladophorales show a range of divergent morphologies that led to their classification in four genera in two families. We sequenced partial large- and small-subunit rDNA as well as the internal transcribed spacer region of 14 of the 16 described endemic taxa to clarify their phylogenetic relationships. One endemic morphospecies, Cladophora kusnetzowii, was shown to be conspecific with the widespread Aegagropila linnaei. All other endemic morphospecies formed a monophyletic group nested within the genus Rhizoclonium (Cladophoraceae), a very surprising result, in stark contrast to their morphological affinities. The Baikal clade represents a species flock of closely related taxa with very low genetic differentiation. Some of the morphospecies were congruent with lineages recovered in the phylogenies, but due to the low phylogenetic signal in the rDNA sequences the relationships within the Baikal clade were not all well resolved. The Baikal clade appears to represent a recent radiation, based on the low molecular divergence within the group, and it is hypothesized that the large morphological variation results from diversification in sympatry from a common ancestor in Lake Baikal.

Patterns of relatedness in the Kudoidae with descriptions of Kudoa chaetodoni n. sp. and K. lethrini n. sp. (Myxosporea: Multivalvulida)

Parasitology ◽  
2006 ◽  
Vol 134 (5) ◽  
pp. 669-681 ◽  
Author(s):  
M. A. A. BURGER ◽  
T. H. CRIBB ◽  
R. D. ADLARD
Keyword(s):  
Host Specificity ◽  
Geographical Distribution ◽  
Phylogenetic Analyses ◽  
Small Subunit ◽  
Tissue Tropism ◽  
Rdna Sequences ◽  
Small Subunit Rdna ◽  
Molecular Phylogenetic ◽  
The Brain ◽  
18S Rdna Sequence

SUMMARYTwo morphologically novel Kudoa species are characterized from brain tissue of fish, Kudoa chaetodoni n. sp. from Chaetodon unimaculatus (Chaetodontidae) and Kudoa lethrini n. sp. from Gymnocranius audleyi and Lethrinus harak (Lethrinidae). Additionally we characterized a 5-spore valve (SV) Kudoa species from the brain of Sillago ciliata (Sillaginidae). Intriguingly, its 18S rDNA sequence was identical to that of the 7 SV Kudoa yasunagai extracted from the brain of a paralichthyid halibut in Japan. These 2 species may either prove to be con-specific, even though morphology and distribution differ, or demonstrate the limit of specific resolution in the small subunit rDNA gene region. Small subunit rDNA sequences from these new species were used in molecular phylogenetic analyses of kudoids to examine congruence of phylogeny with tissue tropism, geographical distribution, and host specificity. There was significant correlation between tissue tropism in the form of well-supported brain and heart-infecting clades. Host specificity and geographical distribution showed some correlations with genotype.

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