Universität zu Köln

Permann, Charlotte, Becker, Burkhard ORCID: 0000-0002-7965-1396 and Holzinger, Andreas (2022). Temperature- and light stress adaptations in Zygnematophyceae: The challenges of a semi-terrestrial lifestyle. Front. Plant Sci., 13. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1664-462X

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Abstract

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 temperature shifts and high light levels are major abiotic stresses in semi-terrestrial habitats, in addition to desiccation, which has been reviewed elsewhere. Zygnematophyceae, a species-rich class of streptophyte green algae, is considered a sister-group to embryophytes. They have developed a variety of avoidance and adaptation mechanisms to protect against temperature extremes and high radiation in the form of photosynthetically active and ultraviolet radiation (UV) radiation occurring on land. Recently, knowledge of transcriptomic and metabolomic changes as consequences of these stresses has become available. Land-plant stress-signaling pathways producing homologs of key enzymes have been described in Zygnematophyceae. An efficient adaptation strategy is their mat-like growth habit, which provides self-shading and protects lower layers from harmful radiation. Additionally, Zygnematophyceae possess phenolic compounds with UV-screening ability. Resting stages such as vegetative pre-akinetes tolerate freezing to a much higher extent than do young cells. Sexual reproduction occurs by conjugation without the formation of flagellated male gametes, which can be seen as an advantage in water-deficient habitats. The resulting zygospores possess a multilayer cell wall, contributing to their resistance to terrestrial conditions. Especially in the context of global change, understanding temperature and light tolerance is crucial.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Permann, Charlotte UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Burkhard UNSPECIFIED orcid.org/0000-0002-7965-1396 UNSPECIFIED Holzinger, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-666208
DOI:	10.3389/fpls.2022.945394
Journal or Publication Title:	Front. Plant Sci.
Volume:	13
Date:	2022
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	1664-462X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GREEN-ALGA ZYGNEMA; ECOPHYSIOLOGICAL PERFORMANCE; DESICCATION TOLERANCE; ELECTRON-TRANSPORT; PHENOLIC-COMPOUNDS; ANTARCTIC STRAINS; OSMOTIC-STRESS; STREPTOPHYTA; UV; TERRESTRIAL Multiple languages Plant Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66620