Abstract
Ahmad, N, Wyn Jones, R. G. and Jeschke, W. D. 1987. Effect of exogenous glycinebetaine on Na+ transport in barley roots.—J. exp. Bot. 38: 913-921. A comparison has been made of the kinetics of 22Na+ uptake into excised barley roots and roots pre-loaded with glycinebetaine. The elevated intracellular glycinebetaine or a metabolic consequence thereof increased the Na+ influx, and the effect was related to the level of internal glycinebetaine and/or Na+ [CI-]. The quasi-steady-state Na+ influx at the tonoplast rather than the plasmalemma influx was apparently influenced by glycinebetaine loading. The tonoplast fluxes and vacuolar Na + content were consistently higher in glycinebetaine-loaded roots than unloaded roots. A membrane modifying role of glycinebetaine in relation to ion compartmentation is discussed. Key words—Excised roots, glycinebetaine, Na+, ion fluxes, barley. Correspondence to: Department of Biochemistry and Soil Science, University College of North Wales, Bangor, Gwynedd, Wales, U.K.
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