Summary
Uptake of NO2 and ozone via stomata and their elimination in the mesophyll were investigated using mechanistic mathematical models. The common hypotheses, postulating the disproportionation reaction of NO2 being the predominant path for the transformation of NO2 into the cellular nitrate and nitrite pools, could be falsified because it fails to reproduce the sorption characteristics as determined experimentally. If, however, the reduction of the pro-oxidative NO2 by apoplastic ascorbate is taken into account the calculated uptake rates and the effects of changes in immission concentration and vegetation characteristics fit well within corresponding experimental results. The onset of acute injury in case of a fall in apoplastic ascorbate concentration below a critical level is postulated.
In the case of ozone the results of the model calculations corroborate the hypotheses that apoplastic ascorbate is an essential factor controlling the uptake of this chemically reactive trace gas, too. The model developed contains furthermore a comprehensive mathematical description of the dynamic distribution of ascorbic acid/ascorbate between the different plant cell compartments.
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Kohlmaier, G.H., Ramge, P., Plöchl, M., Badeck, F. (1997). Modelling the Uptake and Metabolisation of Nitrogen Dioxide and Ozone by Plant Leaves. In: Slanina, S. (eds) Biosphere-Atmosphere Exchange of Pollutants and Trace Substances. Transport and Chemical Transformation of Pollutants in the Troposphere, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03394-4_43
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DOI: https://doi.org/10.1007/978-3-662-03394-4_43
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