Carbon dioxide fixation and photoevolution of hydrogen and oxygen in a mutant of Chlamydomonas lacking Photosystem I
- Oak Ridge National Lab., TN (United States); and others
Sustained photoassimilation of atmospheric CO{sub 2} and simultaneous photoevolution of molecular hydrogen and oxygen has been observed in a Photosystem I deficient mutant B4 of Chlamydomonas reinhardtii that contains only Photosystem II. The data indicate that Photosystem II alone is capable of spanning the potential difference between water oxidation/oxygen evolution and ferredoxin reduction. The rates of both CO{sub 2} fixation and hydrogen and oxygen evolution are similar in the mutant to that of the wild-type C. reinhardtii 137c containing both photosystems. The wild-type had stable photosynthetic activity, measured as CO{sub 2} fixation, under both air and anaerobic conditions, while the mutant was stable only under anaerobic conditions. The results are discussed in terms of the fundamental mechanisms and energetics of photosynthesis and possible implications for the evolution of oxygenic photosynthesis.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 183298
- Report Number(s):
- NREL/CP-430-20036-Vol.2; CONF-9504160-VOL.2; ON: DE95009296; TRN: 95:008711-0009
- Resource Relation:
- Conference: 1995 DOE/NREL hydrogen program review, Coral Gables, FL (United States), 18-21 Apr 1995; Other Information: PBD: Sep 1995; Related Information: Is Part Of Proceedings of the 1995 US DOE hydrogen program review, Volume II; PB: 876 p.
- Country of Publication:
- United States
- Language:
- English
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