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The Influence of Plant Nitrogen Status on NO 2 Uptake, NO 2 Assimilation and on the Gas Exchange Characteristics of Barley Plants Exposed to Atmospheric NO 2

A. J. ROWLAND-BAMFORD and M. C. DREW
Journal of Experimental Botany
Vol. 39, No. 206 (September 1988), pp. 1287-1297
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23692072
Page Count: 11
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The Influence of Plant Nitrogen Status on NO
          2
          Uptake, NO
          2
          Assimilation and on the Gas Exchange Characteristics of Barley Plants Exposed to Atmospheric NO
          2
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Abstract

Barley plants were grown in nutrient solution at two contrasting nitrate concentrations to produce plants of low or high nitrogen (N) status. Leaves were then exposed continuously to either 0.3 mm3 dm-3 NO2 or clean air, with the roots and rooting medium isolated from the polluted air. Uptake of NO2 was measured in two ways; as depletion from an air stream containing the gas and using 15N-labelled NO2. Results from the two methods agreed well and demonstrated that the flux of NO2 into the leaves of N-deficient barley was lower than that of N-sufficient plants. Nevertheless, the relative contribution of 15N derived from 15NO2 to the N status of the plant was greater in the plants supplied with low nitrate. A major factor in regulating NO2 uptake by barley leaves appeared to be stomatal conductance, although internal conductance may also be involved. The effects of NO2 exposure of barley on carbon dioxide exchange rates, transpiration and water vapour conductance were also influenced by the N status of the plant.

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