Changes in water relations,photosynthetic activity and proline accumulation in one-year-old olive trees (<Emphasis Type="Italic">Olea europaea</Emphasis> L. cv. Chemlali) in response to NaCl salinity |
| |
Authors: | C Ben Ahmed B Ben Rouina M Boukhris |
| |
Institution: | (1) Laboratory of Vegetal Ecophysiology, Department of Life Sciences, Faculty of Sciences of Sfax, 3000 Sfax, Tunisia;(2) Laboratory of Amelioration of Oleo Culture productivity and Fruit Plants, Olive Tree Institute Sfax, Sfax, Tunisia |
| |
Abstract: | The comparative responses of young olive trees (Olea europaea L. cv “Chemlali”) to different NaCl salinity levels were investigated over 11 months. One-year-old own rooted plants were
grown in 10-L pots containing sand and perlite mixture (1:3 v/v). Trees were subjected to three irrigation treatments: CP
(control plants that were irrigated with fresh water); SS1 (salt stressed plants irrigated with water containing 100 mM NaCl)
and SS2 plants (salt stressed plants irrigated with water containing 200 mM NaCl). Shoot elongation rate, relative water content,
leaf water potential and net carbon dioxide exchange rates decreased significantly with increased NaCl salinity level. Under
stressed conditions, the increase of Na+ and Cl− ions in both leaves and roots was accompanied with that of proline and soluble sugars. The above results show that the accumulation
of proline and sugars under stressed conditions could play a role in salt tolerance. The absence of toxicity symptoms under
both stress treatments and the superior photosynthetic activity recorded in SS1-treated plants suggest that cv Chemlali is
better able to acclimatize to 100 mM NaCl than at 200 mM NaCl. Our findings indicate that saline water containing 100 mM NaCl,
the most available water in arid region in Tunisia, can be recommended for the irrigation of cv Chemlali in the arid south
of Tunisia. |
| |
Keywords: | Leaf water relations Olive tree cv Chemlali Photosynthetic performances Proline accumulation Salt stress |
本文献已被 SpringerLink 等数据库收录! |
|