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Solute distribution between vacuole and cytosol of sugarcane suspension cells: Sucrose is not accumulated in the vacuole

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Abstract

The compartmentation of solutes in suspension cells of Saccharum sp. during different growth phases in batch culture was determined using CuCl2 to permeabilize the plasma membrane of the cells. The efflux of cytosolic and vacuolar pools of sugars, cations and phosphate was monitored, and the efflux data for phosphate were compared and corrected using data from compartmentation analysis of phosphate as determined by 31P-nuclear magnetic resonance spectroscopy. The results show that sucrose is not accumulated in the vacuoles at any phase of the growth cycle. On the other hand, glucose and fructose are usually accumulated in the vacuole, except at the end of the cell-culture cycle when equal distribution of glucose and fructose between the cytosol and the vacuole is found. Both Na+ and Mg2+ are preferentially located in the vacuoles, but follow the same tendency as glucose and fructose with almost complete location in the vacuole in the early culture phases and increasing cytosolic concentration with increasing age of the cell culture. Potassium ions are always clearly accumulated in the cytosol at a concentration of about 80 mM; only about 20% of the cellular K+ is located inside the vacuole. Cytosolic phosphate is little changed during the cell cycle, whereas the vacuolar phosphate pool changes according to total cellular phosphate. In general there are two different modes of solute compartmentation in sugarcane cells. Some solutes, fructose, glucose, Mg2+ and Na+, show high vacuolar compartmentation when the total cellular content of the respective solute is low, whereas in the case of ample supply the cytosolic pools increase. For other solutes, phosphate and K+, the cytosolic concentration tends to be kept constant, and only excess solute is stored in the vacuole and remobilized under starvation conditions. The behaviour of sucrose is somewhat intermediate and it appears to equilibrate easily between cytosol and vacuole.

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Abbreviations

NMR:

nuclear magnetic resonance

References

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Author information

Correspondence to Ewald Komor.

Additional information

The very cooperative help by Dr. J. Reiner with the 31P-NMR measurements and the technical assistance by D. Keis are gratefully acknowledged. This research was supported by the Deutsche Forschungsgemeinschaft and by Fonds der Chemischen Industrie.

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Preisser, J., Sprügel, H. & Komor, E. Solute distribution between vacuole and cytosol of sugarcane suspension cells: Sucrose is not accumulated in the vacuole. Planta 186, 203–211 (1992). https://doi.org/10.1007/BF00196249

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Key words

  • Cell culture (compartmentation) Compartmentation (cytosol/vacuole)
  • Ion compartmentation
  • Plasma membrane permeabilization
  • Saccharum (solute compartmentation)
  • Sugar compartmentation (lack of sucrose accumulation)