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Plant Physiology 50:547-550 (1972)
© 1972 American Society of Plant Biologists

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Articles

Photosynthetic Properties of Permaplasts of Anacystis1

Bailey Warda,2 and Jack Myersb

a Department of Botany, The University of Texas, Austin, Texas 78712, Department of Zoology, The University of Texas, Austin, Texas 78712

A treatment procedure using lysozyme and ethylenediaminetetracetic acid gave intact but permeable cells (permeaplasts) of Anacystis nidulans. Rates of electron transport from water to carbon dioxide, ferricyanide, 2,6-dichlorophenol indophenol, benzoquinone, and methyl viologen, and from reduced indophenol to methyl viologen were measured as a function of treatment time. Rates of oxygen evolution in complete photosynthesis and electron flow from water to methyl viologen showed rapid and parallel decline with treatment time. Electron flow from water to ferricyanide and from reduced indophenol to methyl viologen increased during the first half hour of treatment (phase 1) to 60 to 80% of the original photosynthetic rate. Longer treatment (phase 2) resulted in decreased rate of ferricyanide reduction but not in rate of methyl viologen reduction from indophenol. Electron flow from water to quinone was two to three times higher than for complete photosynthesis in intact cells. It remained high during phase 1 and declined during phase 2. Phase 1 permeaplasts apparently retain high activity for photosystems 1 and 2 photoreactions.

2 Present address: Department of Biology, University of Mississippi, University, Miss. 38677.

1 This study was supported by Grant GM 11300 from the National Institutes of Health.






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