Abstract
Perfusion experiments with excised internodes of tomato ( Lycopersicon esculentum cv Moneymaker) showed that the uptake of glutamic acid and sucrose from the xylem vessels is accompanied with coupled proton co-transport and potassium antiport at low pH (<5.5). At high pH (5.5) both proton and potassium co-transport accompany the uptake. The results fit into the proton pump concept.
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