Universität zu Köln

Kolomiiets, Anastasiia ORCID: 0000-0001-7849-1135, Bren, Oleksandr, Přibyl, Pavel, Kvíderová, Jana ORCID: 0000-0002-5700-477X, Procházková, Lenka ORCID: 0000-0003-3995-6483, Pushkareva, Ekaterina ORCID: 0000-0002-7200-1681, Elster, Josef ORCID: 0000-0002-4535-5636 and Becker, Burkhard ORCID: 0000-0002-7965-1396 (2025). Unveiling the molecular mechanisms of the stress resilience of High Arctic Klebsormidium flaccidum: a multifaceted study. Plant and Cell Physiology, 66 (10). pp. 1397-1411. Oxford University Press. ISSN 0032-0781

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Abstract

The green alga Klebsormidium is found worldwide in terrestrial and freshwater habitats. A novel strain was isolated from biological soil crusts on Breinosa Mountain in Svalbard (High Arctic, 78°N) to investigate its adaptation to extreme Arctic conditions, characterized by low temperatures and short periods of snow-free ground. Genetic analyses confirmed the strain’s identity as Klebsormidium flaccidum, showing high genetic similarity to strains from polar and temperate habitats. This study explored the effects of nitrogen starvation, cold stress, desiccation, and freezing, focusing on molecular responses and stress resilience. Nitrogen starvation strongly impacted metabolic activity, while cold and desiccation stress had more subtle effects, with K. flaccidum showing permanent stress-related gene expression instead of acute responses. Cold acclimation was found to enhance desiccation and freezing tolerance, while nitrogen starvation worsened the effects of these stresses. These results suggest that K. flaccidum CCALA 1182 is inherently capable of withstanding fluctuating environmental stresses, highlighting its potential for survival in diverse and harsh ecosystems.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Kolomiiets, Anastasiia UNSPECIFIED https://orcid.org/0000-0001-7849-1135 UNSPECIFIED Bren, Oleksandr UNSPECIFIED UNSPECIFIED UNSPECIFIED Přibyl, Pavel UNSPECIFIED UNSPECIFIED UNSPECIFIED Kvíderová, Jana UNSPECIFIED https://orcid.org/0000-0002-5700-477X UNSPECIFIED Procházková, Lenka UNSPECIFIED https://orcid.org/0000-0003-3995-6483 UNSPECIFIED Pushkareva, Ekaterina UNSPECIFIED https://orcid.org/0000-0002-7200-1681 UNSPECIFIED Elster, Josef UNSPECIFIED https://orcid.org/0000-0002-4535-5636 UNSPECIFIED Becker, Burkhard UNSPECIFIED https://orcid.org/0000-0002-7965-1396 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-811352
Identification Number:	10.1093/pcp/pcaf091
Journal or Publication Title:	Plant and Cell Physiology
Volume:	66
Number:	10
Page Range:	pp. 1397-1411
Number of Pages:	15
Date:	22 October 2025
Publisher:	Oxford University Press
ISSN:	0032-0781
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Botanical Institute
Subjects:	Life sciences
Uncontrolled Keywords:	Keywords Language Arctic biocrusts ; cold stress ; cryo stress ; desiccation ; Klebsormidium flaccidum ; nitrogen starvation English
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/81135