Electronic Resource
Springer
Planta
135 (1977), S. 297-299
ISSN:
1432-2048
Keywords:
Phloem-loading
;
Proton co-transport
;
Ricinus
;
Sugar transport
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Loading of 14C-labelled sugars from the hollow petiole of Ricinus communis L. was stimulated by potassium and by low pH in that both the 14C-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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00384903
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