Journal article

A comparative study of fluxes and compartmentation of nitrate and ammonium in early-successional tree species

X Min, MY Siddiqi, RD Guy, ADM Glass, HJ Kronzucker

PLANT CELL AND ENVIRONMENT | WILEY | Published : 1999

Abstract

13NO3/- and 13NH4/+ compartmental analyses were carried out in seedling roots of trembling aspen (Populus tremuloides Michx.), lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) and interior Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) at 0.1 and 1.5 tool m-3 external NO3/- or NH4/+ concentrations ([NO3/-](o) or [NH4/+](o), respectively). At the lower [NO3/-](o), the capacities and efficiencies of acquisition and accumulation of NO3/-, based upon NO3/- fluxes and cytoplasmic NO3/- concentrations ([NO3/-](c)), were in the order aspen >> Douglas-fir > pine. At 1.5 tool m-3 [NO3/-](o), the NO3/- influx increased 18-fold in pine, four-fold in Douglas-fir a..

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