| Autor: |
Sobrado MA; Laboratorio de Biología Ambiental de Plantas, Departamento de Biología de Organismos, Universidad Simón Bolívar, Apartado 89.000, Caracas, Venezuela. msobrado@usb.ve |
| Jazyk: |
angličtina |
| Zdroj: |
Revista de biologia tropical [Rev Biol Trop] 2006 Jun; Vol. 54 (2), pp. 371-5. |
| DOI: |
10.15517/rbt.v54i2.13877 |
| Abstrakt: |
Leaf gas exchange was assessed in Avicennia germinans L. grown under different NaCl concentrations (0-40 per thousand), 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 per thousand), but increased up to 30-32% at higher NaCl concentration (20-40 per thousand). 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 per thousand) and by 22% at high NaCl concentration (40 per thousand). Thus, Pn / gs decreased and water use efficiency was lower during drought compared to estimates prior to salt-relief. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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