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  • 1
    Electronic Resource
    Electronic Resource
    Photosynthetic and respiratory electron transport in a cyanobacterium (1986)
    Springer
    Photosynthesis research 9 (1986), S. 135-147 
    Details
    ISSN: 1573-5079
    Keywords: blue-green algae ; eyanobacterium ; cytochrome C553 ; electron transport ; photosynthesis ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the cyanobacterium Agmenellum quadruplicatum steady-state redox conditions were monitored in vivo for cytochrome (δ+c553) and P700 versus intensities of an actinic light 1 or light 2 (mainly absorbed by photosystems, and 2, respectively). Parallel measurements of O2 evolution were used to calibrate intensities for rates of electron transfer. Results show that the quality of actinic light (as light 1 or light 2) depends on intensity as well as wavelength. The contribution of electron flow from respiration is confirmed by observations of relative rate of photoreaction 1 estimated from Ip (intensity × fraction of P700 reduced). With 3,- (3,4-dichlorophenyl-1, 1-dimethylurea) (DCMU) the rate of photoreaction 1 depends upon, and is sensitive to small changes in, the rate of dark respiration. Very slow transient dark reductions of Cyt (f+c553) and P700 following any low intensity actinic light 1 are attributed to respiratory electron flow. Cyclic electron flow around photoreaction 1 cannot be large compared to dark respiration and cannot vary significantly with light intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029739
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  • 2
    Electronic Resource
    Electronic Resource
    Is there significant cyclic electron flow around photoreaction 1 in cyanobacteria? (1987)
    Springer
    Photosynthesis research 14 (1987), S. 55-69 
    Details
    ISSN: 1573-5079
    Keywords: blue-green algae ; cyanobacteria ; cyclic electron flow ; photoreaction 1 ; photosynthesis ; P700 ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Evidence for a cyclic electron flow has been sought by study of the steady-state poise of P700 and rate of photoreaction 1 in three cyanobacteria. Under an actinic light 1 (440 or 680 nm) the rate of photoreaction 1 is limited by the rate of electron supply provided by photoreaction 2 and by all return electron flow from low potential donors such as ferredoxin and NAD(P)H. Plots of p, the steady-state fraction of P700 reduced, versus the reciprocal intensity, 1/I, yield linear segments of slope Ip. From considerations of a simple model the slopes and extrapolated intercepts of the linear segments provide estimates of the rate of return electron flow. Analysis shows that the total return electron flow cannot be large, by one estimate not more than three times the rate of dark respiration. This result leads to a conclusion that cyclic electron flow (and any dependent phosphorylation) is not a significant process in these cyanobacteria at ordinary light intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019592
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