A comparison between ammonium and nitrate nutrition of young sugar-beet plants grown in nutrient solutions at constant acidity. 2. Effect of light and carbohydrate supply.

Authors

  • H. Breteler

DOI:

https://doi.org/10.18174/njas.v21i4.17244

Abstract

The effect of light and of glucose in the nutrient medium on the release of OH- or H+ and on ion accumulation by sugar beet plants grown with NO3 or NH4 nutrition was studied at a constant pH of 5.50. Decrease in OH- production rate in the dark was probably caused by retarded nitrate assimilation or carbohydrate shortage in the roots. Decrease in the rate of H+ production (NH4 uptake) in the dark was probably due to carbohydrate depletion. Both 24-h illumination and the addition of glucose increased H+ production during NH4 uptake and OH- production during NO3 uptake. 24 h darkness decreased the carboxylate pool on both N sources and it was tentatively concluded that light and darkness exert more influence on the carboxylate pool than N assimilation. Relationships between organic acid, carbohydrate and N metabolism, H+ or OH- production and inorganic composition were considered in detail. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Published

1973-11-01

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Section

Papers