Journal
MARINE POLLUTION BULLETIN
Volume 60, Issue 5, Pages 710-717Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2009.11.025
Keywords
Heavy metal tolerance; Non-photochemical quenching (NPQ); Photoprotection; Photosynthesis; Polyphenols
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The relationship between light acclimation and Cu2+ tolerance was studied in two populations of Fucus serratus known to be naturally non-tolerant and tolerant to Cu2+. Acclimation to high irradiances increased the photosynthetic tolerance to Cu2+. The xanthophyll cycle was apparently not involved in protecting the photosynthetic apparatus against Cu2+ toxicity, as results showed that Cu2+ did not induce dynamic photoinhibition. The higher photosynthetic Cu2+ resistance of high light algae did not result in increased growth. The excess energy acquired by high light-adapted algae appeared to be utilized in Cu2+ defense mechanisms in the Cu2+ non-tolerant population. The polyphenol content of the algae was reciprocal to the Cu-T content, suggesting that polyphenol may be the primary Cu2+ defense of non-tolerant low light algae, acting through secretion and extracellular chelating of Cu2+, while the compounds do not seem to be involved in the primary Cu2+ tolerance mechanism in Cu2+ tolerant algae. (C) 2009 Elsevier Ltd. All rights reserved.
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