Abstract
Inorganic carbon and nitrate uptake were examined in whole plants of Fucus distichus L. (Powell) incubated in dilutions of synthetic ocean water and media with different concentrations of Na+, K+ and Cl−. Reduction in salinity from normal seawater (33 ppt) decreased carbon uptake rate but increased nitrate uptake rate by 50% each. Substitution of K+ for Na+ at constant ionic strength decreased nitrate uptake. Substitution of K+ or mannitol for Na+ decreased carbon uptake. Neither the uptake of nitrate or carbon was changed by substituting SO42- for Cl−. Ionophores, valinomycin and monensin, inhibited both nitrate uptake and carbon fixation from 20 to 70% of control rates. The stimulation of nitrate uptake at low salinity may be beneficial to plants in estuarine tidal environments in which nitrate is supplied by the fresh water source.
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