UVB-induced DNA and photosystem II damage in two intertidal green macroalgae: Distinct survival strategies in UV-screening and non-screening Chlorophyta.

Pescheck, Frauke, Lohbeck, Kai T., Roleda, Michael Y. and Bilger, Wolfgang (2014) UVB-induced DNA and photosystem II damage in two intertidal green macroalgae: Distinct survival strategies in UV-screening and non-screening Chlorophyta. Journal of Photochemistry and Photobiology B: Biology, 132 . pp. 85-93. DOI 10.1016/j.jphotobiol.2014.02.006.

[img] Text
1-s2.0-S1011134414000438-main.pdf - Published Version
Restricted to Registered users only

Download (821Kb) | Contact

Supplementary data:

Abstract

Ultraviolet-B-induced (UVB, 280-315 nm) accumulation of cyclobutane pyrimidine dimers (CPDs) and deactivation of photosystem II (PS II) was quantified in two intertidal green macroalgae, Ulva clathrata and Rhizoclonium riparium. The species were chosen due to their shared habitats but contrasting UVB screening potentials. In the non-screening U. clathrata CPDs accumulated and PS II activity declined as a linear function of applied UVB irradiance. In R. riparium UVB-induced damage was significantly lower than in U. clathrata, demonstrating an efficient UVB protection of DNA and PS II by screening. Based on the UVB irradiance reaching the chloroplasts, both species showed an identical intrinsic sensitivity of PS II towards UVB, but DNA lesions accumulated slower in U. clathrata. While repair of CPDs was similar in both species, U. clathrata was capable of restoring its PS II function decidedly faster than R. riparium. In R. riparium efficient screening may represent an adaptation to its high light habitat, whereas in U. clathrata high repair rates of PS II appear to be important to survive natural UVB exposure. The role of shading of the nucleus by the large chloroplasts in U. clathrata is discussed.

Document Type: Article
Keywords: Rhizoclonium riparium; Ulva clathrata; Cyclobutane pyrimidine dimers; Green alga; Photosynthesis; Repair; Ultraviolet radiation; Screening
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.jphotobiol.2014.02.006
ISSN: 1011-1344
Date Deposited: 04 Nov 2014 09:12
Last Modified: 05 Oct 2017 12:54
URI: http://oceanrep.geomar.de/id/eprint/25949

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...