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Plant Physiology 49:240-243 (1972)
© 1972 American Society of Plant Biologists

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Photosynthetic Activities of the Halophilic Alga Dunaliella parva

Ami Ben-Amotz and Mordhay Avron

a Department of Biochemistry, Weizmann Institute of Science, Rehovot, Israel

Dunaliella parva, a unicellular halophilic alga, was found to evolve oxygen photosynthetically only in the presence of a high osmolar concentration. Cell free preparations were obtained by placing the cells in a medium of low osmolarity. The fragments obtained showed a high photoreducing and photophosphorylating activity except for their inability to catalyze all ferredoxin dependent photoreactions. Placing the cells in a medium of intermediate osmolarity produced a "chloroplast" preparation which maintained some capacity for O2 evolution and CO2 fixation, while possessing the ability to catalyze the photoinduced reduction of ferricyanide. Enzymic and photosynthetic reactions of cell-free preparations from D. parva were inhibited, rather than stimulated, by the salt concentration optimal for growth. These results were interpreted as indicating the existence of a steep NaCl gradient in vivo between the medium and the cell compartments which are not permeable to salt.




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Copyright © 1972 by the American Society of Plant Biologists