Abstract
An investigation was carried out to study the cation-anion balance in different tissues of tomato plants supplied with nitrate, urea, or ammonium nitrogen in water culture.
Irrespective of the form of nutrition, a very close balance was found in the tissues investigated (leaves, petioles, stems, and roots) between total cations (Ca, Mg, K and Na), and total anions (NO3−, H2PO4−, SO4−−, Cl−) total non-volatile organic acids, oxalate, and uronic acids. In comparison with the tissues of the nitrate fed plants, the corresponding ammonium tissues contained lower concentrations of inorganic cations, and organic acids and a correspondingly higher proportion of inorganic anions. Tissues from the urea plants were intermediate between the other 2 treatments. These results were independent of concentration or dilution effects, caused by growth. In all tissues approximately equivalent amounts of diffusible cations (Ca++, Mg++, K+ and Na+), and diffusible anions (No3−, SO4−−, H2PO4−, Cl−) and non-volatile organic acids were found. An almost 1:1 ratio occurred between the levels of bound calcium and magnesium, and oxalate and uronic acids. This points to the fact that in the tomato plant the indiffusible anions are mainly oxalate and pectate. Approximately equivalent values were found for the alkalinity of the ash, and organic anions (total organic acids including oxalate, and uronic acids).
The influence of nitrate, urea, and ammonium nitrogen nutrition on the cation-anion balance and the organic acid content of the plant has been considered and the effects of these different nitrogen forms on both the pH of the plant and the nutrient medium and its consequences discussed.
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Selected References
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- Arnon D. I., Fratzke W. E., Johnson C. M. HYDROGEN ION CONCENTRATION IN RELATION TO ABSORPTION OF INORGANIC NUTRIENTS BY HIGHER PLANTS. Plant Physiol. 1942 Oct;17(4):515–524. doi: 10.1104/pp.17.4.515. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Clark H. E. EFFECT OF AMMONIUM AND OF NITRATE NITROGEN ON THE COMPOSITION OF THE TOMATO PLANT. Plant Physiol. 1936 Jan;11(1):5–24. [PMC free article] [PubMed] [Google Scholar]
- DEKOCK P. C., MORRISON R. I. The metabolism of chlorotic leaves. 2. Organic acids. Biochem J. 1958 Oct;70(2):272–277. doi: 10.1042/bj0700272. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ergle D. R., Eaton F. M. ORGANIC ACIDS OF THE COTTON PLANT. Plant Physiol. 1949 Jul;24(3):373–388. doi: 10.1104/pp.24.3.373. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tracey M. V. A manometric method for the estimation of milligram quantities of uronic acids. Biochem J. 1948;43(2):185–189. doi: 10.1042/bj0430185. [DOI] [PMC free article] [PubMed] [Google Scholar]