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The harmful alga Aureococcus anophagefferens utilizes 19'-butanoyloxyfucoxanthin as well as xanthophyll cycle carotenoids in acclimating to higher light intensities.
MedLine Citation:
PMID:  22627083     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Aureococcus anophagefferens is a picoplanktonic microalga that is very well adapted to growth at low nutrient and low light levels, causing devastating blooms (``brown tides´´) in estuarine waters. To study the factors involved in long-term acclimation to different light intensities, cells were acclimated for a number of generations to growth under low light (20μmol photons m(-2)s(-1)), medium light (60 or 90μmol photons m(-2)s(-1)) and high light (200μmol photons m(-2)s(-1)), and were analyzed for their contents of xanthophyll cycle carotenoids (the D pool), fucoxanthin and its derivatives (the F pool), Chls c(2) and c(3), and fucoxanthin Chl a/c polypeptides (FCPs). Higher growth light intensities resulted in increased steady state levels of both diadinoxanthin and diatoxanthin. However, it also resulted in the conversion of a significant fraction of fucoxanthin to 19'-butanoyloxyfucoxanthin without a change in the total F pool. The increase in 19'-butanoyloxyfucoxanthin was paralleled by a decrease in the effective antenna size, determined from the slope of the change in F(0) as a function of increasing light intensity. Transfer of acclimated cultures to a higher light intensity showed that the conversion of fucoxanthin to its derivative was a relatively slow process (time-frame of hours). We suggest the replacement of fucoxanthin with the bulkier 19'- butanoyloxyfucoxanthin results in a decrease in the light-harvesting efficiency of the FCP antenna and is part of the long-term acclimative response to growth at higher light intensities.
Authors:
Meriem Alami; Dusan Lazar; Beverley R Green
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-21
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  -     ISSN:  0006-3002     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
Affiliation:
Department of Botany, University of British Columbia, Vancouver BC, V6T 1Z4 Canada.
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