Nitrogen absorption by plant root from the culture medium where organic and inorganic nitrogen coexist

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Abstract
The investigation was done to clarify which nitrogen compounds, organic or inorganic, was preferentially absorbed by the root from the medium where they coexist. A. The plant, pretreated with NO3 for ten days after depletion of seed's nutrients, was treated with three mixed nitrogen compounds, 15N-NO3, [2,3-3H]Arg, and [U-14C]GluNH3, at the same concentration of 10 ppm nitrogen. The treatment conditions consist of light (6000 lux) or darkness and high (20°C) or low (4–5°C) medium temperature. Under high temperature condition, nitrogen absorption was in the following order; GluNH2-N> Arg-N> NO3-N under both light and dark conditions. Under low temperature condition, the order became as follows; Arg-N>GluNH2-N> NO3-N. Arg was less susceptible to low temperature treatment than others. B. The plant absorbed organic nitrogens preferentially to inorganic one. C. Among three chemicals, GluNH2 was supplied to the plant in the form of [G-3H]-GluNH2. It was quickly metabolised as a good nitrogen source. D. Consequently, it could be concluded that barley plant absorbs some oraanic nitrogens preferentially to inorganic ones.

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