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Salt stress-induced cell death in the unicellular green alga Micrasterias denticulata
Programmed cell death (PCD) is a key element in normal plant growth and development which may also be induced by various abiotic and biotic stress factors including salt stress. In the present study,
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.
Photodamage of the photosynthetic apparatus and its dependence on the leaf developmental stage in the npq1 Arabidopsis mutant deficient in the xanthophyll cycle enzyme violaxanthin de-epoxidase.
The results confirm that the xanthophyll cycle protects chloroplasts from photooxidation by a mechanism distinct from non-photochemical energy quenching and they reveal that the absence of xanthoptera cycle can be compensated by other protective mechanisms.
Investigating cytoskeletal function in chloroplast protrusion formation in the arctic-alpine plant Oxyria digyna.
Observations suggest that, in contrast to studies on stromule formation in Nicotiana, microtubules are not involved in the formation and morphology of chloroplast protrusions in Oxyria digyna.
Temperature-sensitive formation of chloroplast protrusions and stromules in mesophyll cells of Arabidopsis thaliana
Summary.In leaf mesophyll cells of transgenic Arabidopsis thaliana plants expressing GFP in the chloroplast, stromules (stroma-filled tubules) with a length of up to 20 μm and a diameter of about
Characterization of an UV- and VIS-absorbing, purpurogallin-derived secondary pigment new to algae and highly abundant in Mesotaenium berggrenii (Zygnematophyceae, Chlorophyta), an extremophyte
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
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.
Antioxidant composition of selected high alpine plant species from different altitudes
The present study suggests that the combined effect of lower temperature and higher light intensity induces higher antioxidant contents in plants growing under the particular in vivo conditions experienced in Austria.