title: Cd and Ni transport and accumulation in the halophyte Sesuvium portulacastrum: implication of organic acids in these processes.
abstract: The implication of organic acids in Cd and Ni translocation was studied in the halophyte species Sesuvium portulacastrum. Citric, fumaric, malic, and ascorbic acids were separated and quantified by HPLC technique in shoots, roots and xylem saps of plants grown on nutrient solutions added with 50 μM Cd, 100 μM Ni and the combination of 50 μM Cd + 100 μM Ni. Results showed that Cd had no significant impact on biomass production while Ni and the combination of both metals drastically affected plant development. Cadmium and Ni concentrations in tissues and xylem sap were higher in plants subjected to individual metal application than those subjected to the combined effect of Cd and Ni suggesting a possible competition between these metals for absorption. Both metals applied separately or in combination induced an increase in citrate concentration in shoots and xylem sap but a decrease of this concentration in the roots. However, a minor relationship was observed between metal application and fumaric, malic, and ascorbic acids. Both observations suggest the implication of citric acid in Cd, Ni translocation and shoot accumulation in S. portulacastrum. The relatively high accumulation of citric acid in xylem sap and shoot of S. portulacastrum could be involved in metal chelation and thus contributes to heavy metal tolerance in this species.
authors.affiliation: Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria Hammam-lif, Tunisia ; School of Dietetics and Human Nutrition, McGill University (Macdonald Campus) Sainte Anne de Bellevue, QC, Canada.
authors.forename: Mejda
authors.initials: M
authors.lastname: Mnasri
authors.affiliation: Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria Hammam-lif, Tunisia.
authors.forename: Rim
authors.initials: R
authors.lastname: Ghabriche
authors.affiliation: Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria Hammam-lif, Tunisia.
authors.forename: Emna
authors.initials: E
authors.lastname: Fourati
authors.affiliation: Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria Hammam-lif, Tunisia.
authors.forename: Hanen
authors.initials: H
authors.lastname: Zaier
authors.affiliation: School of Dietetics and Human Nutrition, McGill University (Macdonald Campus) Sainte Anne de Bellevue, QC, Canada.
authors.forename: Kebba
authors.initials: K
authors.lastname: Sabally
authors.affiliation: Engineering Department of Bioresource, McGill University (Macdonald Campus) Sainte Anne de Bellevue, QC, Canada.
authors.forename: Suzelle
authors.initials: S
authors.lastname: Barrington
authors.affiliation: Groupe de Recherche en Physiologie végétale, Earth and Life Institute - Agronomy, Université catholique de Louvain Louvain-la-Neuve,Belgium.
authors.forename: Stanley
authors.initials: S
authors.lastname: Lutts
authors.affiliation: Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria Hammam-lif, Tunisia.
authors.forename: Chedly
authors.initials: C
authors.lastname: Abdelly
authors.affiliation: Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria Hammam-lif, Tunisia.
authors.forename: Tahar
authors.initials: T
authors.lastname: Ghnaya
keywords: halophytes; heavy metals; organic acids; phytoremediation; translocation
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