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Plant Physiology 87:223-225 (1988) © 1988 American Society of Plant Biologists Sodium-Stimulated NO3 Uptake in Amaranthus tricolor L. Plants ru MatohPlant Nutrition Laboratory, Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, Kyoto 606, Japan Nitrate uptake of Na+ -deficient Amaranthus tricolor L. cv Tricolor seedlings from complete culture solution was stimulated by about 210% within 5 hours by application of 0.5 millimolar NaCl. From a Na+ -preloading experiment, intracellular Na+ was shown to be responsible for the stimulation of NO3 uptake. The results suggest a possible role of Na+ in NO3 uptake in C4 plants.
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