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Revista de Biología Tropical

On-line version ISSN 0034-7744Print version ISSN 0034-7744


SOBRADO, M.A. Differential leaf gas exchange responses to salinity and drought in the mangrove tree Avicecennia germinans (Avicenniaceae). Rev. biol. trop [online]. 2006, vol.54, n.2, pp.371-375. ISSN 0034-7744.

Leaf gas exchange was assessed in Avicennia germinans L. grown under different NaCl concentrations (0-40‰), after salt-relief, and then during drought. Stomatal conductance (gs) and net photosynthetic rate (Pn) decreased with increasing NaCl concentration, and intrinsic water use efficiency (Pn / gs) increased. Under desalinization Pn / gs declined. Thus, gs did not change in plants grown at low NaCl concentration (10‰), but increased up to 30-32% at higher NaCl concentration (20 - 40‰). However, Pn was only slightly enhanced (10- 15%). Under drought, Pn decreased by as much as 46% in plants grown at low NaCl concentration (10‰) and by 22% at high NaCl concentration (40‰). Thus, Pn / gs decreased and water use efficiency was lower during drought compared to estimates prior to salt-relief. Rev. Biol. Trop. 54(2): 371-375. Epub 2006 Jun 01.

Keywords : Avicennia germinans; mangrove; NaCl; stomatal conductance; water use efficiency.

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