Effects of severe CO(2) starvation on the photosynthetic electron transport chain in tobacco plants
Status PubMed-not-MEDLINE Language English Country Netherlands Media print
Document type Journal Article
- Publication type
- Journal Article MeSH
Tobacco plants (Nicotiana tabacum) were kept in CO(2) free air for several days to investigate the effect of lack of electron acceptors on the photosynthetic electron transport chain. CO(2) starvation resulted in a dramatic decrease in photosynthetic activity. Measurements of the electron transport activity in thylakoid membranes showed that a loss of Photosystem II activity was mainly responsible for the observed decrease in photosynthetic activity. In the absence of CO(2) the plastoquinone pool and the acceptor side of Photosystem I were highly reduced in the dark as shown by far-red light effects on chlorophyll fluorescence and P700 absorption measurements. Reduction of the oxygen content of the CO(2) free air retarded photoinhibitory loss of photosynthetic activity and pigment degradation. Electron flow to oxygen seemed not to be able to counteract the stress induced by severe CO(2) starvation. The data are discussed in terms of a donation of reducing equivalents from mitochondria to chloroplasts and a reduction of the plastoquinone pool via the NAD(P)H-plastoquinone oxidoreductase during CO(2) starvation.
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Plant Physiol. 1987 Jun;84(2):218-24 PubMed
Photosynth Res. 1990 Sep;25(3):279-93 PubMed
Biochim Biophys Acta. 1971 Apr 6;234(1):83-91 PubMed
J Bioenerg Biomembr. 1995 Aug;27(4):415-21 PubMed
Plant Physiol. 1992 Dec;100(4):1621-6 PubMed
Photosynth Res. 1986 Jan;10(1-2):51-62 PubMed
FEBS Lett. 1977 Oct 1;82(1):159-62 PubMed
Planta. 1999 Aug 12;209(2):250-258 PubMed
FEBS Lett. 1996 Jan 15;378(3):277-80 PubMed
Arch Biochem Biophys. 1951 Dec;34(2):339-51 PubMed
Biochim Biophys Acta. 1998 Jan 27;1363(1):59-69 PubMed
Plant Physiol. 1996 Sep;112(1):265-272 PubMed
Plant Physiol. 1990 Apr;92(4):1053-61 PubMed
Biochim Biophys Acta. 1993 Jul 5;1143(2):113-34 PubMed
Plant Physiol. 1998 May;117(1):129-39 PubMed
Mol Gen Genet. 1987 Dec;210(3):385-93 PubMed
J Biol Chem. 1989 Aug 25;264(24):14129-35 PubMed
Proc Natl Acad Sci U S A. 1992 Feb 15;89(4):1408-12 PubMed
Biochim Biophys Acta. 1977 May 11;460(2):247-58 PubMed
Photosynth Res. 1995 Nov;46(1-2):269-75 PubMed
Photosynth Res. 1993 Jun;36(3):205-15 PubMed
Photosynth Res. 1992 Dec;34(3):449-64 PubMed
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