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This review discusses rates of active membrane transport of sugars in nectar secretion in comparison with sugar fluxes in other plant systems. Possible mechanisms of sugar membrane transport are evaluated, namely vectorial group transfer reactions mediated by membrane bound phosphatases and chemi-osmotic coupling to H+-electro-chemical gradients. The chemical composition of nectar is discussed in relation to the secretion mechanism leading to specific sugar elimination and also in relation to the possible evolution of specific amino acid secretion mechanisms.

NECTAR COMPOSITION AND MEMBRANE TRANSPORT OF SUGARS AND AMINO ACIDS : A REVIEW ON THE PRESENT STATE OF NECTAR RESEARCH