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3 results on '"Zaier, H."'

1. Evaluation of the Cd2+ phytoextraction potential in the xerohalophyte Salsola kali L. and the impact of EDTA on this process

Author

UCL - SST/ELI/ELIA - Agronomy, Ben Rejeb, K., Ghnaya, T., Zaier, H., Benzarti, M., Baioui, R., Ghabriche, R., Wali, M., Lutts, Stanley, Abdelly, C., UCL - SST/ELI/ELIA - Agronomy, Ben Rejeb, K., Ghnaya, T., Zaier, H., Benzarti, M., Baioui, R., Ghabriche, R., Wali, M., Lutts, Stanley, and Abdelly, C.

Abstract

The application of the phytoextraction in saline soil contaminated with heavy metals requires the identification of appropriate plant species showing high salinity tolerance concomitant with an important ability of heavy metal accumulation. The objective of this works is to evaluate the capacity of the xerohalophyte, Salsola kali, to extract Cd2+ from an artificially contaminated soil (100μg Cd2+g-1 soil) in the presence of NaCl (100mM) and/or EDTA (1mmolkg-1 soil). Results showed that in the absence of NaCl or EDTA, Cd2+ was essentially accumulated in the roots reaching 400μg Cd2+g-1 DW, while in the shoots Cd2+ concentration did not exceed 85μg Cd2+g-1 DW. Addition of NaCl to the soil significantly reduced root Cd2+ concentration, but had no impact on Cd2+ concentration in the shoots. The addition of the EDTA results in a twofold increase of Cd2+ concentration in shoots. This is due to the improvement of Cd2+ absorption efficiency by the EDTA concomitant with an increase of Cd2+ translocation to the shoots. These data suggest that S. kali is very promising species for the decontamination of Cd2+ contaminated salty soil. Its phytoextraction potential was significantly enhanced by the addition of EDTA. © 2013 Elsevier B.V.

Published
2013

2. Cd and Ni transport and accumulation in the halophyte Sesuvium portulacastrum: implication of organic acids in these processes.

Author

Mnasri M, Ghabriche R, Fourati E, Zaier H, Sabally K, Barrington S, Lutts S, Abdelly C, and Ghnaya T

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.

Published
2015
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3. Implication of organic acids in the long-distance transport and the accumulation of lead in Sesuvium portulacastrum and Brassica juncea.

Author

Ghnaya T, Zaier H, Baioui R, Sghaier S, Lucchini G, Sacchi GA, Lutts S, and Abdelly C

Subjects
Biological Transport, Citric Acid metabolism, Fumarates metabolism, Plant Roots metabolism, Plant Shoots metabolism, Xylem metabolism, Aizoaceae physiology, Lead metabolism, Mustard Plant physiology, Soil Pollutants metabolism
Abstract

The implication of organic acids in Pb translocation was studied in two species varying in shoot lead accumulation, Sesuvium portulacastrum and Brassica juncea. Citric, fumaric, malic and α-cetoglutaric acids were separated and determined by HPLC technique in shoots, roots and xylem saps of the both species grown in nutrient solutions added with 200 and 400 μM of Pb(II). The lead content of the xylem saps was determined by ICP-MS. Results showed that S. portulacastrum is more tolerant to Pb than B. juncea. Lead concentration in xylem sap of the S. portulacastrum was significantly greater than in that of B. juncea. For both species, a positive correlation was established between lead and citrate concentrations in xylem sap. However minor relationship was observed for fumaric, malic and α-cetoglutaric acids. In the shoots lead treatment also induced a significant increase in citric acid concentration. Both observations suggest the implication of citric acid in lead translocation and shoot accumulation in S. portulacastrum and B. juncea. The relatively high accumulation of citric acid in xylem sap and shoot of S. portulacastrum could explain its high potential to translocate and accumulate this metal in shoot suggesting their possible use to remediate Pb polluted soils., (Published by Elsevier Ltd.)

Published
2013
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