The Relationship of Nitrate Reductase Activity to Uptake and Assimilation of Atmospheric 15NO2 -Nitrogen in Needles of Norway Spruce (Picea abies [L.] Karst.)

von Ballmoos, Peter; Nussbaum, Stefan; Brunold, Christian (1993). The Relationship of Nitrate Reductase Activity to Uptake and Assimilation of Atmospheric 15NO2 -Nitrogen in Needles of Norway Spruce (Picea abies [L.] Karst.). Isotopes in environmental and health studies, 29(1-2), pp. 59-70. Gordon and Breach Publishers 10.1080/10256019308046136

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Using NO2, relations between nitrate reductase activity and stomatal conductance, N-uptake and N-glutamate were studied in the two youngest needles flushes of potted Norway spruce (Picea abies [L.] Karst.). There were linear correlations between the stomatal conductance and the N-uptake and between the N-uptake and nitrate reductase (E.C. 1.6.6.1/1.6.6.2) activity. The N labelling of free glutamate shows the assimilation of NO2 from the atmosphere in addition to the nitrogen from the soil. The portion of glutamate originating from NO2 was linearly related to nitrate reductase activity in spring experiments. This indicates that this enzyme activity reflected the rate of NO2-assimilation.

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