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Plant Physiology 84:210-213 (1987)
© 1987 American Society of Plant Biologists

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Development and Growth Regulation

Energization and Activation of Inorganic Carbon Uptake by Light in Cyanobacteria 1

Aaron Kaplan, Drora Zenvirth, Yehouda Marcus, Tatsuo Omata and Teruo Ogawa

Department of Botany, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel, Solar Energy Research Group, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-01, Japan

The requirement of the inorganic carbon (Ci) transport system for light in cyanobacteria was investigated in Anabaena variabilis by the filtering centrifugation technique and in a mutant (E1) isolated from Anacystis nidulans using a gas exchange system. Ci transport capability increased with time of preillumination and decreased following darkening. Full activity could not be obtained by operating either photosystem II (PSII) or photosystem I alone. 3(3,4 Dichlorophenyl)-1,1 dimethylurea strongly inhibited Ci uptake. Very low activity of PSII was sufficient to activate Ci uptake. However, in the presence of dithiothreitol PSII activity was not required. We conclude that light may be required to activate as well as to energize Ci uptake in cyanobacteria.

1 Supported by a grant from the United States-Israel Binational Science Foundation (BSF) and by the Institute of Chemical and Physical Research (RIKEN).




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Copyright © 1987 by the American Society of Plant Biologists