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.
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References
Amesz J (1973) Biochim Biophys Acta 301:35–51
Anderson JW, Foyer CH and Walker DA (1983) Biochim Biophys Acta 724: 69–74
Arnon DI (1959) Nature 184:10–21
Arnon DI, Whatley FR and Allen MB (1958) Science 127:1026–1034
Asada K and Badger MR (1984) Plant and Cell Physiol 35: 1169–1179
Biggins J (1973) Biochemistry 12:1165–1170
Bottomley PJ and Stewart WDP (1976) Arch Microbiol 108:246–258
Duysens LNM, Amesz J and Kamp BM (1961) Nature 190:510–511
Hirano M, Satoh K and Satoh S (1980) Photosynthesis Res 1:149–162
Joliot P and Joliot A (1984) In Sybesma C ed, Advances in Photosynthesis Research vol I pp 399–406, Nijhoff/Junk, The Hague
Jones LW and Myers J (1963) Nature 199:670–672
Kok B and Hoch G (1961) In McElroy WD and Glass B ed, Light and Life pp 397–423, Johns Hopkins Press, Baltimore
Lara C, Romero JM, Flores E, Guerrero MG and Losada M (1984) In Sybesma C ed, Advances in Photosynthesis Research vol II pp 715–718, Nijhoff/Junk, The Hague
Marsho TV and Kok B (1970) Biochim Biophys Acta 223:240–250
Myers J, Graham JR and Wang R (1980) Plant Physiol 66:1144–1149
Myers J. Graham JR and Wang R (1983) Biochim Biophys Acta 722:281–290
Nanba M and Katoh S (1983) Biochim Biophys Acta 725:272–279
Radmer RJ and Kok B (1976) Plant Physiol 58:336–340
Rippka R, Derulies J, Waterbury JB, Herdman M and Stanier RY (1979) J Gen Microbiol 111:1–69
Sandmann G and Malkin R (1983) Biochim Biophys Acta 725:221–224
Scherer S and Boger P (1982) Arch Microbiol 132:329–332
Simonis W and Urbach W (1973) Annu Rev Plant Physiol 24:89–114
Stanier RY (1961) Bacteriol Rev 25:1–17
Van Baalen C (1962) Bot Mar 4:129–139
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This paper is contributed in honor of my longtime friend, L.N.M. Duysens, who has carried still further the eminence of the Dutch tradition in biophysics.
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Myers, J. Photosynthetic and respiratory electron transport in a cyanobacterium. Photosynth Res 9, 135–147 (1986). https://doi.org/10.1007/BF00029739
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DOI: https://doi.org/10.1007/BF00029739