Chlorophyll fluorescence quenching in the alga Euglena gracilis |
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Authors: | Doege Maria Ohmann Erich Tschiersch Henning |
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Institution: | 1.Institut für Pflanzen- und Zellphysiologie, Martin-Luther-Universit?t, Am Kirchtor 1, D-06108, Halle/S., Germany ;2.Institut für Pflanzen- und Zellphysiologie, Martin-Luther-Universit?t, Am Kirchtor 1, D-06108, Halle/S., Germany ; |
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Abstract: | When far red light preincubated cells of Euglena gracilis are transferred to dark or light, chlorophyll fluorescence (F0 and Fm) decreases. Non-photochemical quenching in the dark is suggested to be induced partly by chlororespiration and partly by
changes in the distribution of excitation energy between the photosystems. Depending on the light intensities it was possible
to resolve the non-photochemical quenching into at least three different components. The slowest relaxation phase of non-photochemical
quenching occurred only after exposure to high light and was assigned to photoinhibition. The other two components were an
energy-dependent quenching (qE), and the one which we attribute to a spill over mechanism. We suggest that both photosystems
use a common antenna system consisting of LHC I and LHC II proteins. In contrast to higher plants, qE in Euglena gracilis is independent of the xanthophyll cycle and an aggregation of LHC II.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | chlorophyll fluorescence chlororespiration Euglena photosynthesis spill over state transitions xanthophyll cycle |
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