A5017573232- Protist diversity and phylogeny
- Microbial Community Ecology and Physiology
- Lichen and fungal ecology
- Mycorrhizal Fungi and Plant Interactions
- Diatoms and Algae Research
- Marine and coastal plant biology
- Algal biology and biofuel production
- Biocrusts and Microbial Ecology
- Botany and Plant Ecology Studies
- Marine and coastal ecosystems
- Plant Pathogens and Fungal Diseases
- Marine Biology and Ecology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Genomics and Phylogenetic Studies
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Bryophyte Studies and Records
- Paleontology and Stratigraphy of Fossils
- Environmental DNA in Biodiversity Studies
- Polar Research and Ecology
- Plant Diversity and Evolution
- Yeasts and Rust Fungi Studies
- Legume Nitrogen Fixing Symbiosis
- Allergic Rhinitis and Sensitization
- Botanical Studies and Applications
Charles University
2016-2025
Abstract The distribution patterns of symbiotic algae are thought to be conferred mainly by their hosts, however, they may originate in algal environmental requirements as well. In lichens, predominantly terrestrial associations fungi with or cyanobacteria, the ecological preferences photobionts have not been directly studied so far. Here, we examine putative lichenized alga Asterochloris , and search for existence guilds ‐associating lichens. Therefore, presence phylogenetic signal several...
The Atacama Desert, northern Chile, is one of the driest deserts on Earth and, as such, a natural laboratory to explore limits life and strategies evolved by microorganisms adapt extreme environments. Here we report exceptional adaptation chlorophototrophic eukaryotic algae, prokaryotic cyanobacteria hyperarid extremely high solar radiation conditions occurring in this desert. Our approach combined several microscopy techniques, spectroscopic analytical methods, molecular analyses. We found...
The Neoproterozoic Era records the transition from a largely bacterial to predominantly eukaryotic phototrophic world, creating foundation for complex benthic ecosystems that have sustained Metazoa Ediacaran Period onward. This study focuses on evolutionary origins of green seaweeds, which play an important ecological role in benthos modern sunlit oceans and likely played crucial part evolution early animals by structuring habitats providing novel niches. By applying phylogenomic approach,...
The development of characteristic thallus structures in lichen-forming fungi requires the association with suitable photoautotrophic partners. Previous work suggests that have a specific range compatible photobionts and selected algal strains are also correlated habitat conditions. We rock-inhabiting crust lichen Protoparmeliopsis muralis, which exhibits high flexibility associations. present geographically extended detailed analysis patterns including thalli host superficial colonies....
Taxonomy in silica‐scaled chrysophytes has gone through three morphological phases. From primary studies of the cell morphology 18th century, focus was 20th century replaced by silica structures envelope. Now, latest decades importance DNA sequencing been recognized, not only to support taxonomic framework but also obtain new understanding relations among particular taxa. In first part this review, we provide a historical overview developments taxonomy scale‐bearing chrysophytes. second...
Abstract Taxa of microbial eukaryotes defined on morphological basis display a large degree genetic diversity, implying the existence numerous cryptic species. However, it has been postulated that diversity merely mirrors accumulation neutral mutations. As case taxon to study in protists, we used widely distributed filamentous genus, Klebsormidium , specifically lineage E ( K. flaccidum / nitens complex) containing number morphologically similar strains. Fourteen clades were recognized...
Coccomyxa is a genus of unicellular green algae the class Trebouxiophyceae, well known for its cosmopolitan distribution and great ecological amplitude. The taxonomy this has long been problematic, due to reliance on badly-defined environmentally variable morphological characters. In study, based discovery new species from an extreme habitat, we reassess circumscription in Coccomyxa, using combination DNA sequence data (analyzed with three different methods algorithmic delineation). Our...
Coccoid green algae traditionally classified in Dictyochloropsis have a complex, reticulate chloroplast, when mature, without pyrenoid. They occupy remarkably diverse ecological niches as free‐living organisms or association with lichen‐forming fungi and were recently shown to form two distinct lineages within Trebouxiophyceae. We used polyphasic approach revise the taxonomy of genus. Based on phylogenetic analysis 18S rRNA gene, detailed morphological investigation using comparative...
Abstract Symbiosis plays a fundamental role in nature. Lichens are among the best known, globally distributed symbiotic systems whose ecology is shaped by requirements of all symbionts forming holobiont. The widespread lichen‐forming fungal genus Stereocaulon provides suitable model to study microscopic green algal (i.e., phycobionts) within lichen symbiosis. We analysed 282 specimens, collected diverse habitats worldwide, using ITS rDNA and actin gene sequences sequences. Phylogenetic...
Mutualistic symbioses have contributed to major transitions in the evolution of life. Here, we investigate evolutionary history and molecular innovations at origin lichens, which are a symbiosis established between fungi green algae or cyanobacteria. We de novo sequence genomes transcriptomes 12 lichen algal symbiont (LAS) closely related non-symbiotic (NSA) improve genomic coverage Chlorophyte algae. then perform ancestral state reconstruction comparative phylogenomics. identify least three...
We present a synopsis of studies reporting the free-living occurrence green algal lichen symbionts. give an overview all known photobiont genera together with comprehensive descriptions, taxonomical classification and data. Based on analysis 310 records, we discovered that at least 80% were observed in state. Diplosphaera chodatii, Elliptochloris bilobata Chloroidium ellipsoideum represent both morphologically genetically most frequently reported species. Trebouxia, prevalent genus...
The genus Asterochloris represents one of the most common, widespread, and diverse taxa lichen photobionts. In this report, we describe characterize six new species (A. echinata, A. friedlii, gaertneri, leprarii, lobophora, woessiae) that were identified during our recent investigation photobiont diversity. We found differed genetically, morphologically, ecologically, with respect to their mycobiont partners. Statistical analyses revealed significant morphological differentiation all newly...
Despite considerable research attention during the last 10 years, distribution and biogeography of protists remain as highly controversial issues. The presumably huge population sizes unlimited dispersal capabilities should result in protist ubiquity. However, recent molecular investigations suggest that communities exhibit strong biogeographic patterns. Here, we examined pattern a very common green algal genus Klebsormidium. We evaluated geographic rbcL genotypes for 190 isolates sampled...
Abstract Molecular identification of micro- and macroorganisms based on nuclear markers has revolutionized our understanding their taxonomy, phylogeny ecology. Today, research the diversity eukaryotes in global ecosystems heavily relies ribosomal RNA (rRNA) markers. Here, we present community-curated reference database EUKARYOME for 18S rRNA, internal transcribed spacer (ITS) 28S rRNA all eukaryotes, including metazoans (animals), protists, fungi plants. It is particularly useful arbuscular...
We report the species composition of subaerial epixylic algae and cyanobacteria from a South-East Asian mountain rainforest locality in Cibodas, West Java. Green (Trebouxiophyceae, Chlorophyceae, Trentepohliales) were dominant Cyanobacteria second most frequent group. specifically concentrated on comparison closed primary forest open antropogenic spaces. Trentepohliales dominated spaces with higher light intensities, whereas localities by trebouxiophycean coccal green algae. There was...
Neustupa J., Eliáš M., Škaloud P., Němcová Y. and Šejnohová L. 2011. Xylochloris irregularis gen. et sp. nov. (Trebouxiophyceae, Chlorophyta), a novel subaerial coccoid green alga. Phycologia 50: 57–66. DOI: 10.2216/08-64.1The phylogenetic diversity of algae remains still poorly explored. We characterised in detail two unicellular found on tropical trees Singapore. Light microscopy revealed morphological identity these strains. Depending the age cultures, cells were spherical to cylindrical,...
Background and aims -Knowledge on diversity distribution of algae cyanobacteria in subaerial habitats still lags behind those freshwater marine environments.Notably, data microalgae tropical corticolous are scarce.We investigated species composition epixylic from two Singaporean rainforest localities.We asked whether there differences alpha-diversity samples taken different areas habitat types (bark vs. decaying bare wood).In addition, we turnover (beta-diversity) among areas.Methods -The...
AbstractŠkaloud P., Kynčlová A., Benada O., Kofroňová O. and Škaloudová M. 2012. Toward a revision of the genus Synura, section Petersenianae (Synurophyceae, Heterokontophyta): morphological characterization six pseudo-cryptic species. Phycologia 51: 303–329. DOI: 10.2216/11-20.1Morphological data, based on transmission scanning electron microscopy silica scales, are provided for genetic lineages Synura petersenii species complex as revealed by multiple markers (internal transcribed spacer...
The microalgae of the genus Asterochloris are preferential phycobionts in Cladonia, Lepraria and Stereocaulon lichens. Recent studies have highlighted hidden diversity genus, even though hosting species Cladonia Mediterranean Canarian ecosystems been poorly explored. Phylogenetic analyses were made by concatenation sequences obtained with a plastid - LSU rDNA two nuclear internal transcribed spacer (ITS) actin molecular markers living several populations convoluta-Cladonia foliacea complex,...
The Synura petersenii species complex represents a common, cosmopolitan and highly diverse taxon of autotrophic freshwater flagellates. In this paper, we describe characterize four new (S. borealis, S. heteropora, hibernica laticarina) that have been identified during our extensive sampling habitats in 15 European countries. Morphometric analyses siliceous scales led to the significant phenotypic differentiation all newly described species, their separation from other related complex. Two...
The distribution of microbial eukaryotes (protists) has been frequently discussed during the last two decades. ubiquity hypothesis assumes lack latitudinal gradients in protist diversity due to their unlimited global dispersal. In this study, we examined and very common, globally distributed green algal genus Klebsormidium across climatic zones, focusing on polar regions. We tested whether (i) there is comparable among temperate regions, (ii) a spatial genetic differentiation occurs at...