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. 1971 Sep;48(3):287–293. doi: 10.1104/pp.48.3.287

Correlation between the Suppression of Glucose and Phosphate Uptake and the Release of Protein from Viable Carrot Root Cells Treated with Monovalent Cations

R H Nieman a, Catherine Willis a
PMCID: PMC396851  PMID: 16657783

Abstract

Treating carrot (Daucus carota L.) discs with ice-cold NaCl solutions for 30 minutes caused three effects that appear to be functionally related: the exchange of tissue Ca2+ and Mg2+ for Na+, the release of protein, and the suppression of active uptake of glucose and orthophosphate. Cyclosis continued apparently unabated after treatment with NaCl at concentrations of up to 0.25 m, so the cells remained viable and energetically competent. The correlation between the release of Ca2+ and Mg2+ and release of protein, and between these effects and the suppression of glucose and orthophosphate uptake, supports the hypothesis that divalent cations maintain, and monovalent cations disrupt, linkages between the outer cell surface and proteins required for active solute uptake. Calcium preserved uptake activity only when it was added in time to prevent the release of protein. Cells gradually recovered some glucose uptake activity after it had been completely inactivated by treatment with 0.25 m NaCl. This recovery occurred in the absence of added Ca2+. It was inhibited by puromycin and so appears to require some protein synthesis. Beet (Beta vulgaris L.) discs were more resistant than carrot discs to treatment with NaCl solutions, thus reflecting the difference in tolerance of the two species to sodicity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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