Abstract
Previous reports have indicated positive effects of enriched rhizosphere dissolved inorganic carbon on the growth of salinity-stressed tomato (Lycopersicon esculentum L. Mill. cv. F144) plants. In the present work we tested whether a supply of CO2 enriched air to the roots of hydroponically grown tomato plants had an effect on nitrogen uptake in these plants. Uptake was followed over periods of 6 to 12 hours and measured as the depletion of nitrogen from the nutrient solution aerated with either ambient or CO2 enriched air. Enriched rhizosphere CO2 treatments (5000 μmol mol-1) increased NO3 - uptake up to 30% at pH 5.8 in hydroponically grown tomato plants compared to control treatments aerated with ambient CO2 (360 μmol mol-1). Enriched rhizosphere CO2 treatments had no effect on NH3 + uptake. Acetazolamide, an inhibitor of apoplastic carbonic anhydrase, increased NO3 - uptake in ambient rhizosphere CO2 treatments, but had no effect on NO3 - uptake in enriched rhizosphere CO2 treatments. Ethoxyzolamide, an inhibitor of both cytoplasmic and extracellular carbonic anhydrase, decreased NO3 - uptake in ambient rhizosphere CO2 treatments. In contrast, a CO2 enriched rhizosphere increased NO3 - uptake with ethoxyzolamide, although not to the same extent as in plants without ethoxyzolamide. It is suggested that a supply of enriched CO2 to the rhizosphere influenced NO3 - uptake through the formation of increased amounts of HCO3 - in the cytosol.
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van der Merwe, C., Cramer, M. Effect of enriched rhizosphere carbon dioxide on nitrate and ammonium uptake in hydroponically grown tomato plants. Plant and Soil 221, 5–11 (2000). https://doi.org/10.1023/A:1004751217650
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DOI: https://doi.org/10.1023/A:1004751217650