Abstract
The permeability properties of the cell membrane of a symbiotic Nostoc sp. for glutamate and aspartate were investigated. These compounds were translocated across the plasmalemma by a transport system which showed a very high affinity for glutamate and a lower one for aspartate. Since a concomitant release of glutamate was observed during the uptake of these two amino acids it is concluded that the transport proceeds via a counterexchange mechanism. In addition to this counterexchange a net release of glutamate occurred in the dark. Some aspects concerning the possible function of this transport system in the symbiotic association Geosiphon pyriforme are discussed.
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Strasser, P., Falkner, G. Characterization of the glutamate/aspartate-transport system in a symbiotic Nostoc sp.. Planta 168, 381–385 (1986). https://doi.org/10.1007/BF00392364
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DOI: https://doi.org/10.1007/BF00392364