The effect of ion composition and concentration in the root medium on salt secretion by Aeluropus litoralis was investigated. The presence of a high ionic concentration in the medium stimulated the secretion process. The sodium concentration in the secreted fluid was found to be always higher than its concentration in the medium. A positive correlation was found between the outer sodium chloride concentration and the amount of sodium secreted and/or leaf contents. Sodium secretion exhibited a high efficiency in excluding excess sodium from leaftissues. Sodium retention in the leaves occurred in relatively low rates. The secretion mechanisms were found to be highly selective to sodium, opposing potassium and calcium. In contrast, potassium and calcium were retained in the leaves to a greater degree than sodium. Antagonistic relationships between sodium and potassium and sodium and calcium were observed in secretion. The secreted fluid contains also various organic substances. Several interpretations to the results in connection with the proposed hypotheses to the mechanism of salt secretion were discussed.
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Pollak et al. (1970) studied this question.
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