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Plant and Cell Physiology, 1962, Vol. 3, No. 1 1-4
© 1962

Article

TURNOVER OF PHOSPHATE COMPOUNDS IN CHLORELLA CELLS UNDER PHOSPHATE EFICIENCY IN DARKNESS

SHIGETOH MIYACHI

Institute of Applied Microbiology, University of Tokyo, and Tokugawa Institute for Biological Research Tokyo

1. With the view to get information as to the mode of phosphate transfer among the intracellular phosphorous compounds under nonphotosynthesizing conditions, investigation was made on the changes of P-distribution occurring when the algal cells were incubated in a P-deficient medium in the dark.

2. During the incubation, appreciable decrease of P-content was observed only in the fraction of polyphosphate "B". In parallel with this decrease, an increase of P occurred only in the RNAfraction, indicating that, under non-photosynthesizing conditions, RNA is synthesized with the expenditure of phosphorus of polyphosphate "B".

3. By comparing the present results with those obtained earlier under photosynthesizing conditions, the effect of light on the mode of intracellular mobilization of phosphorous compounds was discussed.

(Received June 8, 1961; )
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