Uphill energy transfer from long-wavelength absorbing chlorophylls to PS II in Ostreobium sp. is functional in carbon assimilation.
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.
Wilhelm
Christian
C
Biology I / Plant Physiology, University of Leipzig, Johannisallee 21--23, 04103, Leipzig, Germany. cwilhelm@rz.uni-leipzig.de
Jakob
Torsten
T
D000042:Absorption; D002244:Carbon / Q000378:metabolism*; D002734:Chlorophyll / Q000737:chemistry*; D004579:Electron Transport; D004735:Energy Transfer; D056890:Eukaryota / Q000254:growth & development / Q000378:metabolism*; D005453:Fluorescence; D007700:Kinetics; D045332:Photosystem II Protein Complex / Q000378:metabolism*
D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D002244:Carbon