Molecular Phylogeny of Conjugating Green Algae (Zygnemophyceae, Streptophyta) Inferred from SSU rDNA Sequence Comparisons

@article{Gontcharov2002MolecularP,
  title={
Molecular Phylogeny of Conjugating Green Algae (Zygnemophyceae, Streptophyta) Inferred from SSU rDNA Sequence Comparisons
},
  author={Andrey A. Gontcharov and Birger Marin and Michael Melkonian},
  journal={Journal of Molecular Evolution},
  year={2002},
  volume={56},
  pages={89-104}
}
Nuclear-encoded SSU rDNA sequences have been obtained from 64 strains of conjugating green algae (Zygnemophyceae, Streptophyta, Viridiplantae). Molecular phylogenetic analyses of 90 SSU rDNA sequences of Viridiplantae (inciuding 78 from the Zygnemophyceae) were performed using complex evolutionary models and maximum likelihood, distance, and maximum parsimony methods. The significance of the results was tested by bootstrap analyses, deletion of long-branch taxa, relative rate tests, and Kishino… 

Unusual position of the genus Spirotaenia (Zygnematophyceae) among streptophytes revealed by SSU rDNA and rbcL sequence comparisons

The results suggest that Spirotaenia is not specifically related to Spirogyra and may not belong to the class Zygnem atophyceae, and the absence of the well-known zygnematophycean 1506 group I intron in all SSU rONA sequences of Spirodaenia supports this conclusion.

MOLECULAR PHYLOGENY AND REVISION OF THE GENUS NETRIUM (ZYGNEMATOPHYCEAE, STREPTOPHYTA): NUCLEOTAENIUM GEN. NOV

The traditional genera Netrium, Cylindrocystis, and Mesotaenium were shown to be paraor polyphyletic, highlighting the inadequacy of phenotypic traits used to define these genera, and a new genus, Nucleotaenium gen. nov., was established.

MOLECULAR PHYLOGENY AND REVISION OF THE GENUS NETRIUM (ZYGNEMATOPHYCEAE, STREPTOPHYTA): NUCLEOTAENIUM GEN. NOV. 1

The genus Netrium has been revised, and a new genus, Nucleotaenium gen. nov., was established, identified as the sister group of the derived Roya/Desmidiales clade and thus occupies a key position in the evolutionary radiation leading to the most species‐rich group of streptophyte green algae.

In search of monophyletic taxa in the family Desmidiaceae (Zygnematophyceae, Viridiplantae): the genus Cosmarium.

It is concluded that more studies involving new isolates, additional molecular markers, and reanalyses of morphological traits are necessary before the taxonomic revision of the genus Cosmarium can be attempted.

Hidden genetic diversity in the green alga Spirogyra (Zygnematophyceae, Streptophyta)

A large number of non-homoplasious synapomorphies was found for Spirogyra and for each clade, which emphasizes the high genetic diversity of this genus and the distance to the remaining Zygnematophyceae.

PHYLOGENY OF SPIROGYRA AND SIROGONIUM (ZYGNEMATOPHYCEAE) BASED ON RBCL SEQUENCE DATA 1

Morphological differences among strains of Spirogyra grouped together on the basis of rbcL data, including laboratory strains derived from clonal cultures, indicate that some characters used in the traditional taxonomy of this group are poor measures of species identity.

PHYLOGENY OF THE CONJUGATING GREEN ALGAE BASED ON CHLOROPLAST AND MITOCHONDRIAL NUCLEOTIDE SEQUENCE DATA 1

The polyphyly of the Zygnemataceae and Mesotaeniaceae with respect to one another was confirmed and have important implications for the evolution of structural characteristics in the group and will require some taxonomic changes.

MOLECULAR PHYLOGENY OF STAURASTRUM MEYEN EX RALFS AND RELATED GENERA (ZYGNEMATOPHYCEAE, STREPTOPHYTA) BASED ON CODING AND NONCODING RDNA SEQUENCE COMPARISONS 1

The phylogeny based on coding and noncoding sequence comparisons confidently resolved a monophyletic core of the genus Staurastrum but also revealed the artificial nature of the traditional genus.

PHYLOGENETIC POSITION OF ZYGOGONIUM ERICETORUM (ZYGNEMATOPHYCEAE, CHAROPHYTA) FROM A HIGH ALPINE HABITAT AND ULTRASTRUCTURAL CHARACTERIZATION OF UNUSUAL APLANOSPORES

A variety of light, confocal, transmission electron microscopy, and cytochemical techniques provided new data on the variable chloroplast shape of Z. ericetorum and its aplanospore structure and development, which has been previously considered taxonomically important but has been ambiguously interpreted.
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