Charlotte Permann
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View article: The <i>Spirogyra</i> genome: signatures of shared and divergent division and differentiation
The <i>Spirogyra</i> genome: signatures of shared and divergent division and differentiation Open
Zygnematophytes emerged as the unexpected closest algal relatives of land plants despite their simple body plans, raising questions about the morphogenetic toolkit present in the last common ancestor of land plants and algae. Genomic analy…
View article: Genetic and morphological variation in the genus <i>Zygogonium</i> (Zygnematophyceae, Charophyta) from localities in Europe and North America and description of <i>Z. angustum</i>, sp. nov.
Genetic and morphological variation in the genus <i>Zygogonium</i> (Zygnematophyceae, Charophyta) from localities in Europe and North America and description of <i>Z. angustum</i>, sp. nov. Open
The globally distributed genus Zygogonium exhibits a narrow environmental range, with 19 morphologically described species. Its molecular characterization is poor, based on a single accession of the type species Z . ericetorum from Austria…
View article: Interdisciplinary investigations of a pristine alpine lake in Austria: The Lake Altaussee Monitoring Program (LAMP)
Interdisciplinary investigations of a pristine alpine lake in Austria: The Lake Altaussee Monitoring Program (LAMP) Open
View article: New Strains of the Deep Branching Streptophyte <i>Streptofilum</i> : Phylogenetic Position, Cell Biological and Ecophysiological Traits, and Description of <i>Streptofilum arcticum</i> <scp>sp. nov</scp>
New Strains of the Deep Branching Streptophyte <i>Streptofilum</i> : Phylogenetic Position, Cell Biological and Ecophysiological Traits, and Description of <i>Streptofilum arcticum</i> <span>sp. nov</span> Open
Streptofilum capillatum was recently described and immediately caught scientific attention, because it forms a phylogenetically deep branch in the streptophytes and is characterised by a unique cell coverage composed of piliform scales. It…
View article: Zygospore formation in Zygnematophyceae predates several land plant traits
Zygospore formation in Zygnematophyceae predates several land plant traits Open
Recent research on a special type of sexual reproduction and zygospore formation in Zygnematophyceae, the sister group of land plants, is summarized. Within this group, gamete fusion occurs by conjugation. Zygospore development in Mougeoti…
View article: Genomes of multicellular algal sisters to land plants illuminate signaling network evolution
Genomes of multicellular algal sisters to land plants illuminate signaling network evolution Open
Zygnematophyceae are the algal sisters of land plants. Here we sequenced four genomes of filamentous Zygnematophyceae, including chromosome-scale assemblies for three strains of Zygnema circumcarinatum . We inferred traits in the ancestor …
View article: High molecular weight DNA extraction from mucilage rich zygnematophycean green algae for long read DNA sequencing
High molecular weight DNA extraction from mucilage rich zygnematophycean green algae for long read DNA sequencing Open
Background: Zygnematophyceae green algae represent the closest living relatives of land plants. Adaptions to hydro-terrestrial environments are evident through the production of mucilage carbohydrates, which are secreted outside algal cell…
View article: Zygospore development of Spirogyra (Charophyta) investigated by serial block-face scanning electron microscopy and 3D reconstructions
Zygospore development of Spirogyra (Charophyta) investigated by serial block-face scanning electron microscopy and 3D reconstructions Open
Sexual reproduction of Zygnematophyceae by conjugation is a less investigated topic due to the difficulties of the induction of this process and zygospore ripening under laboratory conditions. For this study, we collected field sampled zyg…
View article: Striking differences in frost hardiness and inability to cold acclimate in two <i>Mougeotia</i> species (Zygnematophyceae) from alpine and lowland habitats
Striking differences in frost hardiness and inability to cold acclimate in two <i>Mougeotia</i> species (Zygnematophyceae) from alpine and lowland habitats Open
Zygnematophyceae, a class of freshwater green algae, exhibit distinctive seasonal dynamics. The increasing frequency of cold snaps during the growing season might challenge the persistence of some populations. The present study explored th…
View article: Lipid degradation and photosynthetic traits after prolonged darkness in four Antarctic benthic diatoms, including the newly described species Planothidium wetzelii sp. nov.
Lipid degradation and photosynthetic traits after prolonged darkness in four Antarctic benthic diatoms, including the newly described species Planothidium wetzelii sp. nov. Open
In polar regions, the microphytobenthos has important ecological functions in shallow-water habitats, such as on top of coastal sediments. This community is dominated by benthic diatoms, which contribute significantly to primary production…
View article: 3D‐reconstructions of zygospores in <i>Zygnema vaginatum</i> (Charophyta) reveal details of cell wall formation, suggesting adaptations to extreme habitats
3D‐reconstructions of zygospores in <i>Zygnema vaginatum</i> (Charophyta) reveal details of cell wall formation, suggesting adaptations to extreme habitats Open
The streptophyte green algal class Zygnematophyceae is the immediate sister lineage to land plants. Their special form of sexual reproduction via conjugation might have played a key role during terrestrialization. Thus, studying Zygnematop…
View article: Chromosome-level genomes of multicellular algal sisters to land plants illuminate signaling network evolution
Chromosome-level genomes of multicellular algal sisters to land plants illuminate signaling network evolution Open
The filamentous and unicellular algae of the class Zygnematophyceae are the closest algal relatives of land plants. Inferring the properties of the last common ancestor shared by these algae and land plants allows us to identify decisive t…
View article: Zygospores of the green alga Spirogyra: new insights from structural and chemical imaging
Zygospores of the green alga Spirogyra: new insights from structural and chemical imaging Open
Zygnematophyceae, a class of streptophyte green algae and sister group to land plants (Embryophytes) live in aquatic to semi-terrestrial habitats. The transition from aquatic to terrestrial environments requires adaptations in the physiolo…
View article: Temperature- and light stress adaptations in Zygnematophyceae: The challenges of a semi-terrestrial lifestyle
Temperature- and light stress adaptations in Zygnematophyceae: The challenges of a semi-terrestrial lifestyle Open
Streptophyte green algae comprise the origin of land plants and therefore life on earth as we know it today. While terrestrialization opened new habitats, leaving the aquatic environment brought additional abiotic stresses. More-drastic te…
View article: Photophysiological investigations of the temperature stress responses of <i>Zygnema</i> spp (Zygnematophyceae) from subpolar and polar habitats (Iceland, Svalbard)
Photophysiological investigations of the temperature stress responses of <i>Zygnema</i> spp (Zygnematophyceae) from subpolar and polar habitats (Iceland, Svalbard) Open
Zygnematophyceae are main primary producers in polar hydro-terrestrial habitats, characterized by extreme abiotic conditions. They are expected to be strongly impacted by climate change, leading to threats to subpolar and polar ecosystems.…
View article: Search for evolutionary roots of land plant arabinogalactan‐proteins in charophytes: presence of a rhamnogalactan‐protein in <i>Spirogyra pratensis</i> (Zygnematophyceae)
Search for evolutionary roots of land plant arabinogalactan‐proteins in charophytes: presence of a rhamnogalactan‐protein in <i>Spirogyra pratensis</i> (Zygnematophyceae) Open
SUMMARY Charophyte green algae (CGA) are assigned to be the closest relatives of land plants and therefore enlighten processes in the colonization of terrestrial habitats. For the transition from water to land, plants needed significant ph…
View article: Induction of Conjugation and Zygospore Cell Wall Characteristics in the Alpine Spirogyra mirabilis (Zygnematophyceae, Charophyta): Advantage under Climate Change Scenarios?
Induction of Conjugation and Zygospore Cell Wall Characteristics in the Alpine Spirogyra mirabilis (Zygnematophyceae, Charophyta): Advantage under Climate Change Scenarios? Open
Extreme environments, such as alpine habitats at high elevation, are increasingly exposed to man-made climate change. Zygnematophyceae thriving in these regions possess a special means of sexual reproduction, termed conjugation, leading to…
View article: Cell wall characteristics during sexual reproduction of Mougeotia sp. (Zygnematophyceae) revealed by electron microscopy, glycan microarrays and RAMAN spectroscopy
Cell wall characteristics during sexual reproduction of Mougeotia sp. (Zygnematophyceae) revealed by electron microscopy, glycan microarrays and RAMAN spectroscopy Open
Mougeotia spp. collected from field samples were investigated for their conjugation morphology by light-, fluorescence-, scanning- and transmission electron microscopy. During a scalarifom conjugation, the extragametangial zygospores were …
View article: Characterization of Two Zygnema Strains (Zygnema circumcarinatum SAG 698-1a and SAG 698-1b) and a Rapid Method to Estimate Nuclear Genome Size of Zygnematophycean Green Algae
Characterization of Two Zygnema Strains (Zygnema circumcarinatum SAG 698-1a and SAG 698-1b) and a Rapid Method to Estimate Nuclear Genome Size of Zygnematophycean Green Algae Open
Zygnematophyceae green algae (ZGA) have been shown to be the closest relatives of land plants. Three nuclear genomes ( Spirogloea muscicola , Mesotaenium endlicherianum , and Penium margaritaceum ) of ZGA have been recently published, and …