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Photosynthesis, pigments and ultrastructure of the alpine snow alga Chlamydomonas nivalis
Temperature and light-dependence of photosynthesis, and plastid and extraplastid red pigment composition of red snow algae (Chlamydomonas nivalis) from snow patches in the high Alps of Austria are studied to support the cryophilic adaptation of snow algal cells.
Physiological and morphological processes in the Alpine snow alga Chloromonas nivalis (Chlorophyceae) during cyst formation
It is shown that the cysts are photosynthetically highly active, although they do not divide, and that Chloromonas nivalis can cope with low as well as high light conditions, and genetic variations due to spatial isolation are indicated.
Characterization of an UV- and VIS-absorbing, purpurogallin-derived secondary pigment new to algae and highly abundant in Mesotaenium berggrenii (Zygnematophyceae, Chlorophyta), an extremophyte…
- D. Remias, S. Schwaiger, S. Aigner, T. Leya, H. Stuppner, C. Lütz
- Environmental ScienceFEMS microbiology ecology
- 1 March 2012
Attributes and abundances of the purpurogallins found in M. berggrenii strongly suggest that they are of principal ecophysiological relevance like analogous protective pigments of other extremophilic microorganisms, and to prove that this alpine species is a true psychrophile, photosynthesis measurements at ambient conditions were carried out.
Insights into the biology and phylogeny of Chloromonas polyptera (Chlorophyta), an alga causing orange snow in Maritime Antarctica
- D. Remias, Hans Wastian, C. Lütz, T. Leya
- Biology, Environmental ScienceAntarctic Science
- 21 February 2013
The molecular phylogeny confirmed a close relationship of C. polyptera to other Chloromonas species isolated from snow, and seemed to be exclusive to coastal Antarctic ecosystems influenced by animal nutrient input.
Response of arctic snow and permafrost algae to high light and nitrogen stress by changes in pigment composition and applied aspects for biotechnology.
- T. Leya, Andrea Rahn, C. Lütz, D. Remias
- Biology, Environmental ScienceFEMS microbiology ecology
- 1 March 2009
This study showed that cold-adapted, snow and permafrost algae might serve as valuable production strains still exhibiting acceptable growth rates during the cold season in temperate regions and some strains might be interesting novel candidates for biotechnological applications.
Algae Drive Enhanced Darkening of Bare Ice on the Greenland Ice Sheet
Surface ablation of the Greenland ice sheet is amplified by surface darkening caused by light‐absorbing impurities such as mineral dust, black carbon, and pigmented microbial cells. We present the…
Snow and Glacial Algae: A Review1
Molecular phylogenies reveal that snow algae in the Chlamydomonas–Chloromonas– Chlainomonas complex have invaded the snow habitat at least twice, and some species are polyphyletic.
Ecophysiology and ultrastructure of Ancylonema nordenskiöldii (Zygnematales, Streptophyta), causing brown ice on glaciers in Svalbard (high arctic)
Photosynthesis measurements performed at different temperatures and light levels indicate that the metabolism is adapted to temperatures close to the freezing point as well as to high light conditions.
UNUSUAL PHENOLIC COMPOUNDS CONTRIBUTE TO ECOPHYSIOLOGICAL PERFORMANCE IN THE PURPLE-COLORED GREEN ALGA ZYGOGONIUM ERICETORUM (ZYGNEMATOPHYCEAE, STREPTOPHYTA) FROM A HIGH-ALPINE HABITAT
The ecophysiological data suggest that the secondary metabolites in the purple morph are important for light acclimation in high‐alpine habitats, however, the green morph recovered better after 4 d of rehydration following desiccation stress, and may be a key factor for accumulation of these phenolic compounds.
Changes in Phenolic Compounds and Cellular Ultrastructure of Arctic and Antarctic Strains of Zygnema (Zygnematophyceae, Streptophyta) after Exposure to Experimentally Enhanced UV to PAR Ratio
The results indicate that phenolics are involved in UV protection of Zygnema and also revealed different responses to UV stress across the three strains, suggesting that other protection mechanisms may be involved in these organisms.