High photochemical trapping efficiency in Photosystem I from the red clade algae Chromera velia and Phaeodactylum tricornutum
Language English Country Netherlands Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
27737767
DOI
10.1016/j.bbabio.2016.10.002
PII: S0005-2728(16)30631-4
Knihovny.cz E-resources
- Keywords
- Chromera velia, Fluorescence decay, Phaeodactylum tricornutum, Photochemical yield, Photosystem I, Red clade algae, Red spectral forms,
- MeSH
- Alveolata metabolism MeSH
- Chlorophyll metabolism MeSH
- Spectrometry, Fluorescence MeSH
- Photosystem I Protein Complex metabolism MeSH
- Kinetics MeSH
- Energy Transfer physiology MeSH
- Rhodophyta metabolism MeSH
- Diatoms metabolism MeSH
- Light-Harvesting Protein Complexes metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Chlorophyll MeSH
- Photosystem I Protein Complex MeSH
- Light-Harvesting Protein Complexes MeSH
In the present work, we report the first comparative spectroscopic investigation between Photosystem I (PSI) complexes isolated from two red clade algae. Excitation energy transfer was measured in PSI from Chromera velia, an alga possessing a split PsaA protein, and from the model diatom Phaeodactylum tricornutum. In both cases, the estimated effective photochemical trapping time was in the 15-25ps range, i.e. twice as fast as higher plants. In contrast to green phototrophs, the trapping time was rather constant across the whole emission spectrum. The weak wavelength dependence was attributed to the limited presence of long-wavelength emitting chlorophylls, as verified by low temperature spectroscopy. As the trapping kinetics of C. velia PSI were barely distinguishable from those of P. tricornutum PSI, it was concluded that the scission of PsaA protein had no significant impact on the overall PSI functionality. In conclusion, the two red clade algae analysed here, carried amongst the most efficient charge separation so far reported for isolated Photosystems.
References provided by Crossref.org
High light acclimation of Chromera velia points to photoprotective NPQ
Role of Ions in the Regulation of Light-Harvesting
