Abstract
According to general agreement, all photosynthetic organisms using xanthophyll cycling for photoprotection contain either the violaxanthin (Vx) cycle or the diadinoxanthin (Ddx) cycle instead. Here, we report the temporal accumulation of substantial amounts of pigments of the Vx cycle under prolonged high-light stress in several microalgae thought to possess only the Ddx cycle. In the diatom Phaeodactylum tricornutum , used as a model organism, these pigments also participate in xanthophyll cycling, and their accumulation depends on de novo synthesis of carotenoids and on deepoxidase activity. Furthermore, our data strongly suggest a biosynthetic sequence from Vx via Ddx to fucoxanthin in P. tricornutum . This gives experimental support to the long-stated hypothesis that Vx is a common precursor of all carotenoids with an allenic or acetylenic group, including the main light-harvesting carotenoids in most chlorophyll a/c-containing algae. Thus, another important function for xanthophyll cycling may be to optimize the biosynthesis of light-harvesting xanthophylls under fluctuating light conditions.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 10:38 a.m.) |
Deposited | 3 years, 4 months ago (April 13, 2022, 4:43 p.m.) |
Indexed | 1 month, 1 week ago (July 19, 2025, 11:44 p.m.) |
Issued | 26 years, 1 month ago (July 20, 1999) |
Published | 26 years, 1 month ago (July 20, 1999) |
Published Online | 26 years, 1 month ago (July 20, 1999) |
Published Print | 26 years, 1 month ago (July 20, 1999) |
@article{Lohr_1999, title={Algae displaying the diadinoxanthin cycle also possess the violaxanthin cycle}, volume={96}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.96.15.8784}, DOI={10.1073/pnas.96.15.8784}, number={15}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Lohr, Martin and Wilhelm, Christian}, year={1999}, month=jul, pages={8784–8789} }