Salt tolerance of the annual halophyte Cakile maritima as affected by the provenance and the developmental stage

Contenu

Titre
Salt tolerance of the annual halophyte Cakile maritima as affected by the provenance and the developmental stage
Date
2007
Langue
eng
volume
29
Localisation
Springer Link
Résumé
Though halophytes are naturally adapted to salinity, their salt-tolerance limits are greatly influenced by their provenance and developmental stage. In the present study, physio-biochemical responses of two Tunisian ecotypes of the oilseed coastal halophyte Cakile maritima (Brassicaceae) to salinity (0–400 mM NaCl) were monitored during germination and vegetative growth stages. Tabarka and Jerba seeds were collected from humid or arid climatic areas, respectively. Plant response to salinity appeared to depend on the ecotype and salinity levels. Increasing salinity inhibited germination process. Jerba seeds were found to be more salt tolerant than the Tabarka ones. At the autotrophic stage of growth and under salt-free conditions, Jerba was less productive than Tabarka (in terms of dry matter accumulation), but plant biomass production and leaf expansion (area and number) of the former ecotype were progressively improved by 100 mM NaCl, as compared to the control. In contrast, at the same salt concentration, these parameters decreased under increasing salinity in Tabarka (salt sensitive). Leaf chlorophyll content was reduced at severe salinity, but this effect was more conspicuous in the sensitive Tabarka plants. Na+ contents in the Jerba and Tabarka leaves collected from the 400 mM NaCl-treated plants were 17- and 12-fold higher than in the respective controls. This effect was accompanied by a significant reduction in the leaf K+, Mg2+ and Ca2+ contents, especially in the salt-treated Tabarka. A significant accumulation of proline and soluble carbohydrates in leaves was found during the period of intensive leaf growth. These organic compounds likely play a role in leaf osmotic adjustment and in protection of membrane stability at severe salinity.
Est une partie de
Acta Physiologiae Plantarum
numéro
4
pages
375-384
Titre abrégé
Acta Physiol Plant
doi
10.1007/s11738-007-0047-0
issn
1861-1664
Collections
Bibliographie

Megdiche, Wided et al., “Salt tolerance of the annual halophyte Cakile maritima as affected by the provenance and the developmental stage”, 2007, bibliographie, consulté le 18 avril 2024, http://ibadica.org:8080/s/bibliographie/item/157590

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