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Publication Type J
Authors Suarez, N. and E. Medina
Title Influence of salinity on Na+ and K+ accumulation, and gas exchange in Avicennia germinans
Source Photosynthetica
Abstract 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 parts per thousand. Growth and leaf area were affected by salinity higher than 10 parts per thousand. As salinity increased, the predawn leaf water potential (Psi(w)) and leaf osmotic potential (Psi(s)) decreased. Leaf Psi(w) was at least -0.32 MPa lower than the Psi(w) of solution. Na+ and K+ ions explained about 78 % of decrease in psi(s). K+ tissue water concentration decreased by more than 60 % in all salinity treatments as compared with those grown at 0 parts per thousand. 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 parts per thousand; the intereellular 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 parts per thousand).
ISSN 0300-3604
ISBN 0300-3604
Publication Date 2006
Year Published 2006
Volume 44
Issue 2
Beginning Page 268-274
Digital Object Identifier (DOI) 10.1007/s11099-006-0018-5
Unique Article Identifier WOS:000237692200017
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