pH control of the chlorophyll a fluorescence in algae |
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Authors: | George Papageorgiou and Govindjee |
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Affiliation: | 1 Department of Biology, Nuclear Research Center “Democritus”, Athens, Greece a Department of Botany, University of Illinois, Urbana, Ill. 61801, U.S.A. |
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Abstract: | The pH of the suspension medium was found to have a remarkable influence on the “slow” (min) time course of Chlorophyll a fluorescence yield in the green alga Chlorella pyrenoidosa and in the blue-green alga Anacystis nidulans. In Chlorella, the decay of fluorescence yield, in the 1- to 5-min region, is strongly retarded at alkaline pH; this decay rate shows an optimum at pH 6–7. In Anacystis, the rise of fluorescence yield, in the same time range, is decreased optimally at pH 6–7; poisoning with 3(3,4-dichlorophenyl)-1,1-dimethylurea reverses the direction of this pH effect. These observations suggest a correlation of the H+ status (or the processes associated with it such as photophosphorylation and resulting conformational changes) of the chloroplast to the yield of chlorophyll a fluorescence in vivo. |
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Keywords: | DCMU 3(3 4-dichlorophenyl)-1 1-dimethylurea |
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