Proton co-transport of sugars in phloem loading

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1977 English Publisher:Springer Science and Business Media LLCJournal:Planta, volume 135, pages 297-299 (issn: 0032-0935, eissn: 1432-2048,

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Authors: F, Malek; D A, Baker;

doi: 10.1007/bf00384903

pmid: 24420097

Proton co-transport of sugars in phloem loading

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Abstract

Loading of (14)C-labelled sugars from the hollow petiole of Ricinus communis L. was stimulated by potassium and by low pH in that both the (14)C-activity and the sugar concentration of phloem sap collected from a nearby incision increased. A pH drop was observed in the solution perfusing a hollow petiole. This pH drop was greater in the presence of potassium and less in the presence of sugars, while the uncoupler CCCP induced a pH rise in the perfusing solution. Sugars were detected in the perfusing solution when it was buffered at pH>9. A model is proposed for a proton co-transport of sugars from the free space driven by a linked proton efflux/potassium influx pump.

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University of Sussex
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