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  • 1
    Electronic Resource
    Electronic Resource
    Reduction of oxygen by the electron transport chain of chloroplasts during assimilation of carbon dioxide
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Bioenergetics 408 (1975), S. 252-268 
    Details
    ISSN: 0005-2728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2728(75)90128-0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of photosynthetic electron transport and photophosphorylation in intact chloroplasts and leaves of Spinacia oleracea L. (1978)
    Springer
    Planta 143 (1978), S. 41-49 
    Details
    ISSN: 1432-2048
    Keywords: Cyclic photophosphorylation ; Electron transport ; Light scattering ; Photosystem I/II ; Regulation of electron flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Oxygen ist reduced by the electron transport chain of chloroplasts during CO2 reduction. The rate of electron flow to oxygen is low. Since antimycin A inhibited CO2-dependent oxygen evolution, it is concluded that cyclic photophosphorylation contributes ATP to photosynthesis in chloroplasts which cannot satisfy the ATP requirement of CO2 reduction by electron flow to NADP and to oxygen. Inhibition of photosynthesis by antimycin A was more significant at high than at low light intensities suggesting that cyclic photophosphorylation contributes to photosynthesis particularly at high intensities. Cyclic electron flow in intact chloroplasts is under the control of electron acceptors. At low light intensities or under far-red illumination it is decreased by substrates which accept electrons from photosystem I such as oxaloacetate, nitrite or oxygen. Obviously, the cyclic electron transport pathway is sensitive to electron drainage. In the absence of electron acceptors, cyclic electron flow is supported by far-red illumination and inhibited by red light. The inhibition by light exciting photosystem II demonstrated that the cyclic electron transport pathway is accessible to electrons from photosystem II. Inhibition can be relieved by oxygen which appears to prevent over-reduction of electron carriers of the cyclic pathway and thus has an important regulatory function. The data show that cyclic electron transport is under delicate redox control. Inhibition is caused both by excessive oxidation and by over-reduction of electron carriers of the pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389050
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Appearance and development of P700 oxidation and photosystem I activity in etio-chloroplasts prepared from greening barley leaves (1976)
    Springer
    Planta 133 (1976), S. 47-52 
    Details
    ISSN: 1432-2048
    Keywords: P700 oxydation ; Photosystem I ; Chlorophyll ; Chloroplasts ; Electron transport ; Hordeum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development of photosystem I activity of plastids isolated from greening barley (Hordeum distichum, L.) leaves was studied. The electron transport activity in photosystem I was measured as anthraquinone-mediated oxygen uptake and as light induced absorbance changes of the reaction centre molecule P700. P700 oxidation was observed after one hour of greening though an electron transport leading to oxygen uptake was observed after 30 minutes. Phenazine methosulphate had no effect on the oxidation of P700 until after four hours of greening. The ratio chlorophyll/P700 decreased from about 2300/l at one hour to 640/l at sixteen hours of greening. The light intensity dependence of the electron transport of photosystem I showed that the photosynthetic units gradually increased in size as the greening proceeded. The increase of the rate of the oxygen uptake, calculated on plastid basis, decreased after eight hours while the P700 content, calculated on plastid basis, increased continuously between three and sixteen hours. Chromatographic separations and fluorimetric analyses of the chlorophyll pigments showed that the reaction centre molecule could not be protochlorophyllide or chlorophyllide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386005
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    Paper (German National Licenses)
    Fulltext
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