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 Printable version |
Variability of growth and ion accumulation in
Atriplex halimus |
Cahiers Agricultures. Volume 5, Number 5, 367-72, Septembre-Octobre 1996, Étude originale
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 Résumé
Article gratuit
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Author(s) : Hela Ben Ahmed, Ezzedine Zid, Mohamed El Gazzah, Claude Grignon |
Summary : Seeds harvested from the same Atriplex halimus L cv. halimus stock plant growing near the sea were sown, and the plantlets were subsequently grown in synthetic liquid medium under artificial lighting. The Na+ in the medium was adjusted to a suboptimal level (300 mM) for biomass production. The main ions (K
+, Na
+, Ca
2+ and Cl
-) were analysed in the roots, stems and leaves. There was marked heterogeneity in biomass production, ion accumulation, and K
+/Na
+ selectivity during folar accumulation of these ions. The dispersion for each individual value, measured by the coefficient of variation, differed according to parameters, i.e. 58-75% for dry weight, 30-35% for most ionic concentrations, and less than 12% for the Na+ concentration and total cations. The high polymorphism in biomass production highlights the possibility of breeding fast-growing genotypes in saline medium. However, the close linear correlation between the dry weights and the Na
+ concentration indicates that these genotypes would have high cation levels (especially Na
+) in leaves, associated with anion oxalate. |
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