Institut für Botanik II der Universität Salzburg, Lasserstrasse 39, A-5020, Salzburg, Austria.
Planta. 1986 Sep;168(3):381-5. doi: 10.1007/BF00392364.
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.
共生鱼腥藻细胞膜对谷氨酸和天冬氨酸的通透性特性进行了研究。这些化合物通过质膜转运系统进行转运，该系统对谷氨酸具有很高的亲和力，对天冬氨酸的亲和力较低。由于在摄取这两种氨基酸的过程中观察到谷氨酸的伴随释放，因此可以得出结论，该转运通过反向交换机制进行。除了这种反向交换之外，在黑暗中还会发生谷氨酸的净释放。本文还讨论了该转运系统在共生关系中可能具有的功能。
