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Sucrose uptake by cotyledons of Ricinus communis L.: Characteristics, mechanism, and regulation

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Abstract

Cotyledons of Ricinus communis take up externally supplied sucrose at a rate of up to 150 μmol/h/g fresh weight, which is very high when compared with other sugar transport systems of higher plants. The uptake of sucrose is catalysed with a K m of 25 mmol l−1; at high sucrose concentrations a linear (diffusion) component becomes obvious. Other mono-, di-, or trisaccharides do not compete for sucrose uptake. Sucrose is accumulated by the cotyledons up to 100-fold, whereby most of the transported, externally supplied sucrose mixes with sucrose present in the tissue. At low sucrose concentrations, however; a small unexchangeable internal pool of sucrose becomes evident. Poisons of energy metabolism such as FCCP inhibit uptake and accumulation of sucrose. The transport of sucrose induces an increase of respiration, from which an energy requirement of 1.4 ATP/sucrose taken up can be calculated. Sucrose is taken up together with protons at an apparent stoichiometry of 0.3 protons/sucrose. Other sugars do not cause proton uptake. The K m for sucrose induced proton uptake is 5 mmol l−1; the discrepancy to the K m for sucrose uptake as well as the low proton: sucrose stoichiometry might possibly be caused by a large contribution of diffusion barriers. The estimated proton-motive potential difference would by sufficient to explain an electrogenic sucrose accumulation. The rate of uptake of sucrose is subject to feedback inhibition by internal sucrose. It is also regulated during growth of the seedlings since it develops rapidly during the first days of germination and declines again after the 4th day of germination, though no substantial increase of passive permeability resistance was observed.

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Abbreviations

DMO:

dimethyloxazolidinedione

FCCP:

trifluoromethoxy (carbonyl-cyanide) phenylhydrazon

fr. wt.:

fresh weight

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  1. Fachbereich Biologie und Vorklinische Medizin, Institut für Botanik, Universitätsstr 31, D-8400, Regensburg, Federal Republic of Germany

    Ewald Komor

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  1. Ewald Komor
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Komor, E. Sucrose uptake by cotyledons of Ricinus communis L.: Characteristics, mechanism, and regulation. Planta 137, 119–131 (1977). https://doi.org/10.1007/BF00387548

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  • DOI: https://doi.org/10.1007/BF00387548

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