期刊
PHOTOSYNTHESIS RESEARCH
卷 119, 期 3, 页码 273-281出版社
SPRINGER
DOI: 10.1007/s11120-013-9942-y
关键词
Xanthophyll; Diatoms; Raman; Photoprotection; NPQ
资金
- FOM-program The Thylakoid Membrane: A Dynamic Switch [FP126, 12.0344]
- Fondation de l'Ecole Normale Superieure
- Advanced Investigator Grant from the European Research Council (ERC) [267333]
- Deutsche Forschungsgemeinschaft (DFG) [Bu 812-4/5]
- European Research Council (ERC) [267333] Funding Source: European Research Council (ERC)
In this study, we demonstrate the selective in vivo detection of diadinoxanthin (DD) and diatoxanthin (DT) in intact Cyclotella cells using resonance Raman spectroscopy. In these cells, we were able to assess both the content of DD and DT carotenoids relative to chlorophyll and their conformation. In addition, the sensitivity and selectivity of the technique allow us to discriminate between different pools of DD on a structural basis, and to follow their fate as a function of the illumination conditions. We report that the additional DD observed when cells are grown in high-light conditions adopts a more twisted conformation than the lower levels of DD present when the cells are grown in low-light (LL) conditions. Thus, we conclude that this pool of DD is more tightly bound to a protein-binding site, which must differ from the one occupied by the DD present in LL conditions.
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