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The effect on plant growth of NaCl concentrations in soil, under semi-controlled conditions, water content and monovalent cations (Na+ and K+) distributions in seedlings of Avicennia germinans were studied. After 4 weeks of growth, results show that NaCl affected leaf growth more than roots and stems. For the two lower vegetal organs, 100 mmoles of NaCl brought about a significant increase in plant growth. A high retentionrate of Na was noted in seedling epicotyl axes, contributing in delaying young leaves proliferation and thereby, preventing the toxic effects of this ion. Mature leaves exhibited good adaptative behavior toward salinity stress by increasing succulence due to absorption of large quantities of water and K+ in leaves. Potassium uptake in leaves was not found to be affected by NaCl concentration. As a consequence, monovalent cations adsorption resulted in an increase in the water contents of the plant organs. The high accumulation of K+ in leaves of A. germinans show that this ion was the major element responsible for osmotic adjustment in leaf cells. L\'effet de differentes concentrations du milieu en NaCl sur la croissance de la plante, l\'etat hydrique et la distribution des cations monovalents (Na+ et K+) au niveau des organes de Avicennia germinans a ete etudie en conditions semi-controlees. Apres 4 semaines de culture, les resultats montrent que le NaCl amelioresignificativement plus la croissance des feuilles que celle des racines et des tiges. Pour ces derniers organes, une concentration de 100 mmoles de NaCl a entraine une meilleure croissance. Une forte retention de Na a ete observee au niveau des axes epicotyles des plantules, contribuant a reduire l\'envahissement des jeunes feuilles et par consequent, eviter les effets toxiques de cet ion. Les feuilles plus âgees s\'adaptent aux conditions de salinite, a travers l\'augmentation de la succulence, due a une absorption massive d\'eau et de K+. L\'approvisionnement en K+ des feuilles n\'a pas ete affecte par la presence de NaCl dans le milieu. Par consequent, l\'absorption des cations monovalents Na+ et K+ a entraine une augmentation de la teneur en eau des organes etudies. La forte accumulation de K+, au niveau des feuilles, montre que chez A. germinans, cet ion est le principal element responsable de l\'ajustement osmotique des cellules foliaires. Keywords : Mangrove, Avicennia germinans, salinity, ionic transport, Cameroon Agronomie Africaine Vol. 19 (3) 2007: pp. 263-270

agronomie africaine

Salinity effect on seedling growth, water, sodium and potassium distributions in the mangrove species (&lt;i&gt;Avicennia germinans&lt;/i&gt; L. (Avicenniaceae)) in semi controlled conditions.