Plant Physiol. Illumina
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Plant Physiology 82:646-652 (1986)
© 1986 American Society of Plant Biologists

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Articles

Carbon-13 NMR Studies of Salt Shock-Induced Carbohydrate Turnover in the Marine Cyanobacterium Agmenellum quadruplicatum1

Elisha Tel-Or2, Susan Spath, Lester Packer and Rolf J. Mehlhorn

Membrane Bioenergetics Groups, Applied Science Division, Lawrence Berkeley Laboratory, and Department of Physiology-Anatomy, University of California, Berkeley, California 94720

Carbon turnover in response to abrupt changes in salinity, including the mobilization of glycogen for use in osmoregulation was studied with pulse-chase strategies utilizing nuclear magnetic resonance (NMR)-silent and NMR-detectable 12C and 13C isotopes, respectively. Growth of Agmenellum quadruplicatum in 30%-enriched13C bicarbonate provided sufficient NMR-detectability of intracellular organic osmoregulants for these studies. A comparison of NMR spectra of intact cells and their ethanol extracts showed that the intact cell data were suitable for quantitative work, and, when combined with ESR measurements of cell volumes, yielded intracellular glucosylglycerol concentrations without disrupting the cells. NMR pulse-chase experiments were used to show that 13C-enriched glycogen, which had previously been accumulated by the cells under nitrogen-limited growth at low salinities, could be utilized for the synthesis of glucosylglycerol when the cells were abruptly transferred to hypersaline media, but only in the light. It was also shown that the accumulation of glucosylglycerol in the light occurred on a time scale similar to that of cell doubling. Depletion of glucosylglycerol when cells abruptly transferred to lower salinities appeared to be rapid—the intracellular pool of this osmoregulant was decreased 2-fold within 2 hours of hypotonic shock.

2 Permanent address: Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel.

1 Supported by National Institutes of Health (AG-04818) through the Department of Energy under contract No. DE-AC03-76SF00098 and by the Department of Energy (grant DE-AT03-80-ER10637).






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1986 by the American Society of Plant Biologists