Abstract
Three weeks old nodulated plants of two varieties, Coco blanc and Dark, were irrigated with a nutritive solution added with 50 mM NaCl. Changes in growth, nitrogen fixation and mineral composition of tissues were studied on plants harvested weekly during three weeks. Growth of all organs including nodules and nitrogen fixation decreased in the salt treatment. Coco blanc was more tolerant than Dark. Growth and ionic composition of nodules tissues discriminated significantly the two varieties. Relative sensitivity of Dark was associated with much higher dry matter allocation to nodules and also with much higher Na+ and Cl− evels in these organs. Thus, lower nitrogen fixation in this variety would be explained by lower nodule efficiency, probably resulting from excessive ion accumulation in nodules.
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