Universität zu Köln

Busch, Anna and Hess, Sebastian (2022). Sunscreen mucilage: a photoprotective adaptation found in terrestrial green algae (Zygnematophyceae). Eur. J. Phycol., 57 (1). S. 107 - 125. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 1469-4433

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Abstract

Terrestrial microalgae evolved a variety of photoprotective strategies enabling a life on land. This includes the production of sunscreen compounds, which shield cells from excess radiation. Here, we report a new genus of conjugating green algae, Serritaenia gen. nov., whose members produce extracellular mucilage with a striking pigmentation. This phenomenon is very unusual for eukaryotic algae and poses cell biological and functional questions. So far, extracellular sunscreen pigments are exclusively known from cyanobacteria, while eukaryotic algae typically contain intracellular sunscreens. We demonstrate that pigmented mucilage in Serritaenia spp. can be induced by experimental exposure to UVB in an intensity-dependent manner, and that it strongly absorbs deleterious wavebands. Microscopic details of UVR-treated cells suggest that the directional secretion of pigmented mucilage is responsible for the defined and well-oriented pigment layers observed in natural material. Even though the chemical nature of the pigment remains to be elucidated, several pieces of evidence suggest that the 'sunscreen mucilage' of Serritaenia represents an elaborate photoprotective adaptation, unprecedented in eukaryotic algae.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Busch, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED Hess, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-561641
DOI:	10.1080/09670262.2021.1898677
Journal or Publication Title:	Eur. J. Phycol.
Volume:	57
Number:	1
Page Range:	S. 107 - 125
Date:	2022
Publisher:	TAYLOR & FRANCIS LTD
Place of Publication:	ABINGDON
ISSN:	1469-4433
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WAVELENGTH-DEPENDENT INDUCTION; B-INDUCED SYNTHESIS; AMINO-ACIDS; UV-B; ULTRAVIOLET-RADIATION; ZYGNEMA ZYGNEMATOPHYCEAE; SECONDARY CAROTENOIDS; MOLECULAR PHYLOGENY; SEQUENCE ALIGNMENT; PHENOLIC-COMPOUNDS Multiple languages Plant Sciences; Marine & Freshwater Biology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56164