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Uptake and Utilization of Sugar Phosphates by Anabaena flos-aquae

Paul M. Rubin, Ellen Zetooney and Roy E. McGowan
Plant Physiology
Vol. 60, No. 3 (Sep., 1977), pp. 407-411
Stable URL: http://www.jstor.org/stable/4265000
Page Count: 5
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Uptake and Utilization of Sugar Phosphates by Anabaena flos-aquae
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Abstract

The effect of various sugar phosphates on CO2 fixation in Anabaena flos-aquae was investigated and found to be very similar to that found for isolated spinach chloroplasts. One exception, glucose 6-phosphate, has a stimulatory effect on CO2 fixation in Anabaena but not in isolated chloroplasts. Further examination of the role of glucose 6-phosphate metabolism in Anabaena indicates that: (a) this sugar phosphate can be taken up; (b) its uptake is greater in the light than the dark; (c) turnover of glucose 6-phosphate is inhibited in the light; and (d) glucose 6-phosphate can support dark CO2 fixation. These results are discussed with reference to photosynthesis-related control of glucose 6-phosphate metabolism and the role of glucose 6-phosphate as a source for reducing equivalents and ATP in blue-green algae.

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