Photosynthetica 2006, 44(2):268-274 | DOI: 10.1007/s11099-006-0018-5

Influence of salinity on Na+ and K+ accumulation, and gas exchange in Avicennia germinans

N. Suárez1,*, E. Medina1
1 Laboratorio de Ecofisiología Vegetal, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela

We analysed plant growth, ion accumulation, leaf water relations, and gas exchange of Avicennia germinans (L.) L. subjected to a long-term, controlled salinity gradient from 0 to 55 ‰. Growth and leaf area were affected by salinity higher than 10 ‰. As salinity increased, the predawn leaf water potential (Ψw) and leaf osmotic potential (Ψs) decreased. Leaf Ψw was at least -0.32 MPa lower than the Ψw of solution. Na+ and K+ ions explained about 78 % of decrease in Ψs. K+ tissue water concentration decreased by more than 60 % in all salinity treatments as compared with those grown at 0 ‰. Inversely, Na+ concentration in tissue water increased with nutrient solution salinity. The maximum net photosynthetic rate (P N) and stomatal conductance (g s) decreased by 68 and 82 %, respectively, as salinity increased from 0 to 55 ‰; the intercellular CO2 concentration (C i) followed the same trend. The P N as a function of C i showed that both the initial linear slope and upper plateau of the P N vs. C i curve were markedly affected by high salinity (40 and 55 ‰).

Additional key words: growth; leaf water relations; net photosynthetic rate; potassium; stomatal conductance

Received: April 11, 2005; Accepted: September 16, 2005; Published: June 1, 2006  Show citation

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Suárez, N., & Medina, E. (2006). Influence of salinity on Na+ and K+ accumulation, and gas exchange in Avicennia germinans. Photosynthetica, 44(2), 268-274. doi: 10.1007/s11099-006-0018-5
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