Effects of Ammonium and Potassium Ions on Some Physiological and Biochemical Processes of Excised Cucumber Cotyledons |
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Authors: | RABINDRANATH PATNAIK ALLEN V. BARKER DONALD N. MAYNARD |
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Affiliation: | Department of Plant and Soil Sciences, University of Massachusetts, Amherst 01002 USA |
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Abstract: | Incubation of excised cucumber cotyledons (Cucumis sativus L.) with NH4Cl solutions exceeding 0.001 M inhibited their greening, fresh weight increases, and incorporation of 14C-leucine into insoluble N compounds. The absorption of 14C-leucine during incubation and retention of moisture by the excised cotyledons after incubation were greatly diminished by the NH4Cl treatments. Treatment with KCl solutions of the same concentrations as the NH4Cl stimulated the greening, fresh weight increases, and the absorption and incorporation of 14C-leucine. Desiccation of cotyledons stored at 5°C for 10 days was inhibited by dilute KCl solutions. The toxicity of NH4Cl was alleviated by KCl solutions at low concentrations. |
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