Further Studies on the Bicarbonate Stimulation of Photophosphorylation in Isolated Chloroplasts

The bicarbonate effect in stimulating the rate of photophosphorylation by isolated spinach (Spinacia oleracea var. Virginia blight-resistant savoy) chloroplasts at a pH below the optimum has been re-examined. Its seasonal nature may be related to the hormonal status of the plants. Bicarbonate anions...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1974-02, Vol.53 (2), p.220-223
Main Authors: Cohen, William S., Jagendorf, Andre T.
Format: Article
Language:English
Subjects:
Acids
Adenosine triphosphatases
Bicarbonates
Chloroplasts
Enzymes
Phosphates
Phosphorylation
Photophosphorylation
Protons
Spinach
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Summary:The bicarbonate effect in stimulating the rate of photophosphorylation by isolated spinach (Spinacia oleracea var. Virginia blight-resistant savoy) chloroplasts at a pH below the optimum has been re-examined. Its seasonal nature may be related to the hormonal status of the plants. Bicarbonate anions stimulate adenosine 5′-triphosphate synthesis if added in the final, adenosine 5′-triphosphate-forming stage of either a postillumination or an acid-base experiment. They also stimulate the membrane-bound, Mg2+-dependent adenosine 5′-triphosphatase of chloroplasts, and the Ca2+-dependent adenosine 5′-triphosphatase of detached coupling factor. These and other data point to the interaction between energized thylakoid membranes and the coupling factor as the probable site of action of bicarbonate anions when they stimulate photophosphorylation.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.53.2.220