Nitrate or ammonium nutrition in french bean |
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Authors: | S Chaillou J -F Morot-Gaudry C Lesaint L Salsac E Jolivet |
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Institution: | (1) Laboratoire du Metabolisme et de la Nutrition des Plantes, I.N.R.A., route de st-Cyr, F-78000 Versailles, France |
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Abstract: | Summary 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. |
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Keywords: | Ammonium Metabolism Nitrate Phaseolus vulgaris L |
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