Müller, Ruth, Wiencke, Christian, Bischof, Kai and Krock, Bernd (2009) Zoospores of Three Arctic Laminariales Under Different UV Radiation and Temperature Conditions: Exceptional Spectral Absorbance Properties and Lack of Phlorotannin Induction. Photochemistry and Photobiology, 85 (4). pp. 970-977. DOI https://doi.org/10.1111/j.1751-1097.2008.00515.x.

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Abstract

Phlorotannins have often been considered to act as UV‐protective compounds in zoospores of brown algae. However, only the absorption characteristics of zoospores under UV exposure have been determined and no data are available on the actual content of phlorotannins or on temperature–UV interactions. Therefore, we determined the absorbance spectra and the phlorotannin contents in zoospore suspensions of three Arctic species (Saccharina latissima, Laminaria digitata, Alaria esculenta), and in the media surrounding zoospores after exposure to different radiation (400–700, 320–700, 295–700 nm) and temperature (2–18°C) conditions for 8 h. Absorption typical of phlorotannins with a maximum at 276 nm was monitored in zoospore suspensions as well as in the media surrounding zoospores, but the results depended strongly on radiation treatments and on zoospore densities. Surprisingly, the content of UV‐absorbing phlorotannins subsequent to different exposures did not change in any of the three species. The observed exceptional absorption properties could, therefore, not be related to phlorotannin contents. These findings are discussed in light of a strong phlorotannin investment from sporophytes during spore release and a minor UV‐protective role of phlorotannins for zoospores of Arctic kelp species.

Document Type:	Article
Programme Area:	UNSPECIFIED
Research affiliation:	Ecology > Algae and Seagrass Ecology
Refereed:	Yes
Open Access Journal?:	No
DOI:	https://doi.org/10.1111/j.1751-1097.2008.00515.x
ISSN:	00318655
Date Deposited:	25 Feb 2020 14:32
Last Modified:	01 Oct 2020 13:00
URI:	http://cris.leibniz-zmt.de/id/eprint/3400

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