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Articles

Regulation of NO₃^– Influx in Barley ¹

Studies Using ¹³NO₃^–

University of British Columbia, Department of Botany, No. 3529 at 6270 University Boulevard, Vancouver, British Columbia, V6T 2B1, Canada, Biology Department, Mount Allison University, Sackville, New Brunswick, E0A 3C0, Canada, Agriculture Canada Station de Recherches, 2560 Boul. Hochelaga, Ste. Foy, Québec, G1V 2J3, Canada

Short-term (10 minutes) measurements of plasmalemma NO₃^– influx (_oc) into roots of intact barley plants were obtained using ¹³NO₃^–. In plants grown for 4 days at various NO₃^– levels (0.1, 0.2, 0.5 millimolar), _oc was found to be independent of the level of NO₃^– pretreatment. Similarly, pretreatment with Cl^– had no effect upon plasmalemma ¹³NO₃^– influx. Plants grown in the complete absence of ¹³NO₃^– (in CaSO₄ solutions) subsequently revealed influx values which were more than 50% lower than for plants grown in NO₃^–. Based upon the documented effects of NO₃^– or Cl^– pretreatments on net uptake of NO₃^–, these observations suggest that negative feedback from vacuolar NO₃^– and/or Cl^– acts at the tonoplast but not at the plasmalemma. When included in the influx medium, 0.5 millimolar Cl^– was without effect upon ¹³NO₃^– influx, but NH₄⁺ caused approximately 50% reduction of influx at this concentration.

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