Bean Plants were grown in a greenhouse in sand irrigated with nutrient solutions containing either 2 mM NO 3 − or 2 mM NH 4 + . After 45 days fresh weight of NH 4 + plants was half that of NO 3 − plants. Cation concentration in NH 4 + plants was 30% less than in NO 3 − plants. Amino acids (SER, ASN, GLN) accummulated 3 to 10 times more in NH 4 + plants. The concentration of organic acids (malic, malonic, citric) was 10 to 30 times higher in NO 3 − plants. The ATP-costings for the synthesis of amino acids and organic acids in NH 4 + plants was half that of NO 3 − ones: therefore it could not account for the reduction of growth in the ammonium-fed plants.
Key wordsAmmonium Metabolism Nitrate Phaseolus vulgaris L.
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