Abstract
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1.
Since photo-phobic reactions in the blue green alga Phormidium uncinatum seem to be triggered by changes of electron flow rates into or out of an electron pool situated in the electron transport chain between photosystem II and I, the effect of inhibitors affecting the electron transport chain has been studied.
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2.
Dose response curves of the phobic reaction have been measured by varying the trap energy in double beam light trap experiments with constant pairs of monochromatic light. From these dose response curves the effects of the inhibitors on both types of phobic reactions, i.e. exit reactions and entrance reactions, have been calculated.
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3.
Dibromothymoquinone (DBMIB) inhibits the electron transport between the electron pool and photosystem I by preventing the reoxidation of plastoquinone. The phobic entrance reaction, which results in an emptying of the light trap, is triggered by changes in the electron flow out of the pool; thus it is more effected by DBMIB than the exit reaction, which is mediated by the electron transport into the pool.
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4.
The phobic exit reaction, which results in accumulations in the light trap, is triggered by changes in the electron flow into the electron pool via photosystem II. 3-[3,4-dichlorophenyl]-1,1-dimethylurea (DCMU) inhibits the electron transport near photosystem II; thus it affects the exit reaction more than the entrance reaction.
References
Amesz, J.: Photosynthesis, biophysical aspects. In: Fortschritte der Botanik, H. Ellenberg, K. Esser, H. Merxmüller, P. Sitte, H. Ziegler, eds., Vol. 35, pp. 89–102. Berlin-Heidelberg-New York: Springer 1973a
Amesz, J.: The function of plastoquinone in photosynthetic electron transport. Biochim. biophys. Acta (Amst.) 301, 35–51 (1973b)
Amesz, J., Vesser, J.V.M., van den Engh, G. J., Dirks, M.: Reaction kinetics of intermediates of the photosynthetic chain between the two photosystems. Biochim. biophys. Acta (Amst.) 256, 370–380 (1972)
Böhme, H., Reimer, S., Trebst, A.: The effect of dibromothymoquinone, an antagonist of plastoquinone, on non cyclic and cyclic electron flow systems in isolated chloroplasts. Z. Naturforsch. 26b, 341–352 (1971)
Clayton, R.K.: Patterns of accumulation resulting from taxes and changes in motility of microorganisms. Arch. Mikrobiol. 27, 311–319 (1957)
Drews, G.: Beiträge zur Kenntnis der phototaktischen Reaktionen der Cyanophyceen. Arch. Protistenk. 104, 389–430 (1959)
Engelmann, Th.W.: Über Licht- und Farbenperzeption niederster Organismen. Pflügers Arch. ges. Physiol. 29, 387–400 (1882)
Frickel-Faulstich, B.: Veränderungen im photosynthetischen Elektronentransport einzelliger Grünalgen während des Entwicklungszyklus. Diss. Marburg (1974)
Frickel-Faulstich, B., Senger, H.: Anderungen der DCMU-Empfindlichkeit während des Entwicklungszyklus von Scenedesmus obliquus. Ber. dtsch. bot. Ges. 85, 401–408 (1972)
Häder, D-P.: Untersuchungen zur Photo-phobotaxis bei Phormidium uncinatum. Diss., Marburg (1973)
Häder, D.-P.: Participation of two photosystems in the photo-phobotaxis of Phormidium uncinatum. Arch. Microbiol. 96, 255–266 (1974)
Häder, D.-P., Nultsch, W.: Untersuchungen zur Abgrenzung der Arten Phormidium uncinatum und Phormidium autumnale. Schweiz. Z. Hydrobiol. 33, 566–577 (1971)
Häder, D.-P., Nultsch, W.: Negative photo-phobotactic reactions in Phormidium uncinatum. Photochem. Photobiol. 18, 311–317 (1973)
Halldal, P.: The photosynthetic apparatus of microalgae and its adaptation to environmental factors. In: Photobiology of microorganisms, P. Halldal, ed., pp. 17–55. London-New York-Sydney-Toronto: Wiley Intersci. 1970
Haupt, W.: Die Phototaxis der Algen. Handbuch der Pflanzenphysiologie, Vol. XVII/1, pp. 318–370. Berlin-Göttingen-Heidelberg: Springer 1959
Nultsch, W.: Der Einfluß des Lichtes auf die Bewegung der Cyanophyceen. I. Mitt.: Photo-topotaxis von Phormidium autumnale. Planta (Berl.) 56, 632–647 (1961)
Nultsch, W.: Der Einfluß des Lichtes auf die Bewegung der Cyanophyceen. III. Mitt.: Photo-phobotaxis von Phormidium uncinatum. Planta (Berl.) 58, 647–663 (1962)
Nultsch, W.: Photomotion of microorganisms and its interaction with photosynthesis. In: Photobiology of microorganisms, P. Halldal, ed., pp. 213–252. London-New York-Sidney-Toronto: Wiley Intersci. 1970
Nultsch, W., Häder, D.-P.: Über die Rolle der beiden Photosysteme in der Photo-phobotaxis von Phormidium uncinatum. Ber. dtsch. bot. Ges. 87, 83–92 (1974)
Simonis, W.: Zyklische und nicht-zyklische Photophosphorylierung in vivo. Ber. dtsch. bot. Ges. 80, 395–402 (1967)
Stiehl, H.H., Witt, H.T.: Quantitative treatment of the function of plastoquinone in photosynthesis. Z. Naturforsch. 24b, 1588–1598 (1969)
Trebst, A.: Neue Reaktionen und Substanzen im photosynthetischen Elektronentransport. Ber. dtsch. bot. Ges. 83, 373–398 (1970)
Trebst, A., Harth, E., Draber, W.: On a new inhibitor of photosynthetic electron transport in isolated chloroplasts. Z. Naturforsch. 25b, 1157–1159 (1970)
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Häder, DP. The effect of inhibitors on the electron flow triggering photo-phobic reactions in cyanophyceae. Arch. Microbiol. 103, 169–174 (1975). https://doi.org/10.1007/BF00436345
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DOI: https://doi.org/10.1007/BF00436345