Short-term studies of NO 3 (-) uptake in Pisum using (13)NO 3 (-).

作者: P. Oscarson , B. Ingemarsson , M. af Ugglas , C. -M. Larsson

DOI: 10.1007/BF00402990

关键词:

摘要: Influx, efflux and net uptake of NO 3 − was studied in Pisum sativum L. cv. Marma short-term experiments where 13NO used to trace influx. The influx rate N-limited plants similar both during at external concentrations around 50 μM, low (4–6 μM) when practically zero. Efflux could be inferred from discrepancies between but never very high the uptake. Close threshold concentration for not uptake, equalled Thus, can regarded as a compensation point. inclusion NH 4 + outer medium decreased by about 40% did significantly affect efflux. roles fluxes nitrate-reductase activity regulating/limiting utilization are discussed.

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