Abstract
From the algal genus Ostrobium two species are known which express a chlorophyll antenna absorbing between 710 and 725 nm to a different extent. In a comparative study with these two species it is shown that quanta absorbed by this long wavelength antenna can be transferred to PS II leading to significant PS␣II-related electron transfer. It is documented that under monochromatic far red light illumination growth continues with rather high efficiency. The data show that the uphill-energy transfer to PS II reduces the quantum yield under white light significantly. It is discussed that this strategy of energy conversion might play a role in special environments where far red light is the predominant energy source.
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Abbreviations
- Chl:
-
chlorophyll
- ETR:
-
relative electron transport rate
- F:
-
fluorescence yield
- Fm′:
-
maximal fluorescence yield of illuminated sample
- ΦPS II :
-
Photosytem II quantum yield
- IK :
-
PAR-value characteristic for light saturation
- LHC:
-
light harvesting complex
- PAM:
-
pulse amplitude modulation
- PAR:
-
photosynthetically active radiation
- Pmax :
-
maximal rate of photosynthesis
- PS:
-
Photosystem
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Acknowledgements
The authors acknowledge the contribution of Sandra Kortmann in data collection and technical support. H.-W. Trissl is greatly acknowledged for fruitful discussions and comments.
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Wilhelm, C., Jakob, T. Uphill energy transfer from long-wavelength absorbing chlorophylls to PS II in Ostreobium sp. is functional in carbon assimilation. Photosynth Res 87, 323–329 (2006). https://doi.org/10.1007/s11120-005-9002-3
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DOI: https://doi.org/10.1007/s11120-005-9002-3