Ion Fluxes Across the Transfusion Zone of Secreting Limonium Salt Glands Determined from Secretion Rates, Transfusion Zone Areas and Plasmodesmatal Frequencies |
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Authors: | FARADAY CHRISTOPHER D; QUINTON PAUL M; THOMSON WILLIAM W |
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Abstract: | Faraday, C. D., Quinton, P. M. and Thomson, W. W. 1986. Ionfluxes across the transfusion zone of secreting Limonium saltglands determined from secretion rates, transfusion zone areasand plasmodesmatal frequencies.J. exp. Bot. 37: 482494. The epidermal salt-secreting glands of Limonium (Plumbaginaceae)are enclosed in a cuticular envelope. Ions and metabolites enterthe glands from the mesophyll through gaps in the cuticularenvelope, the transfusion zones. Net influxes of ions acrossthe transfusion zone were calculated from measurements of secretionrates and transfusion zone areas. When leaves of L. pereziiF. T. Hubb. were treated with 300 mol m3 NaCl, transfusionzone influxes of Na+ K+, Ca++ and Cl as high as 7?0?105,1.7?105, 5?8?107 and 8.5?105 mol m2s1 respectively, were calculated. Assuming a transmembranepathway, these fluxes would be some of the highest reportedfor ions in plant cells. Key words: Salt glands, ion fluxes, ultrastructure |
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