|
|
Relation of Pleurocapsa cuprea Hansgirg to the genus Hildenbrandia (Rhodophyta)
CAISOVÁ, Lenka
Pleurocapsa cuprea has been originally described as a relatively common freshwater cyanobacteial species with specific habitat preferences. Due to the striking resemblance of some diagnostic features to the red algal genus Hildenbrandia, morphological, molecular as well as pigment analyses have been done to either confirm or disprove the relationship of Pleurocapsa cuprea to the Cyanobacteria.
|
|
|
Molecular phylogeny and taxonomic revision of chaetophoralean algae (Chlorophyta)
CAISOVÁ, Lenka
Since the human inclination to estimate and trace natural diversity, usable species definitions as well as taxonomical systems are required. As a consequence, the first proposed classification schemes assigned the filamentous and parenchymatous taxa to the green algal order Chaetophorales sensu Wille. The introduction of ultrastructural and molecular methods provided novel insight into algal evolution and generated taxonomic revisions based on phylogenetic inference. However, until now, the number of molecular phylogenetic studies focusing on the Chaetophorales s.s. is surprisingly low. To enhance knowledge about phylogenetic relationships among taxa within the order, the nuclear?encoded SSU rDNA sequences from 30 strains covering all three chaetophoralean families have been investigated. All revealed monophyletic groupings were further screened for molecular non-homoplasious synapomorphies within the Viridiplantae. To address the question of the correspondence between morphological characters traditionally used for taxonomical delimitation of the Chaetophorales and the tree topology favored by molecular data, the list of morphological/ ultrastructural/ecological characters was elaborated and further analyzed. In addition, to obtain a close-up view into the evolution of Compensatory Base Changes (CBCs) of the second internal transcribed spacer (ITS2) which is currently often used to delimit putative biological species, 86 newly obtained/published sequences of ITS2 for five families of the order Ulvales were analyzed. Furthermore, a detailed comparative study of all ITS2 substitutions has been done. Subsequently all revealed CBCs and hemi- CBCs have been mapped upon the ITS2 phylogenetic tree topology. Finally, CBCs/hCBCs taxonomic inference in the Ulvales has been discussed.
|
|
|
Taxonomie rodu \kur{Stigeoclonium} v ČR
CAISOVÁ, Lenka
The genus Stigeoclonium is taxonomically very problematic. The relationships between species of this genus are very little known. There are only a few studies that deal with only morphological revision of the genus Stigeoclonium. Hovewer, up to now no phylogenetic analysis of this genus exists. This study summarizes the knowledge about the genus Stigeoclonim in the Czech Republic and shows the first phylogenetic analysis of this genus.
|
|
| |
host ::
RSS.