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Heavy Metal Accumulation by the Halophyte Species Mediterranean Saltbush

^a Unité de Biologie végétale, Institut des Sciences de la Vie, Université catholique de Louvain, 5 (Bte13) Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium
^b Thader-consultoria Ambiental, C/Poeta Sánchez Marigal 8, 300004 Murcia, Spain
^c Consejería de Agricultura, Agua y Medio Ambiente, Centro de Investigación y Desarollo Agroalimentario, 30150 La Alberca, Murcia, Spain

View larger version (22K): [in a new window]   Fig. 1. Relative growth rates (RGR) of roots, stems, and leaves of Mediterranean saltbush exposed during 1, 2, and 3 wk to either 0.1 mM Cd or Zn. The RGR values were estimated on a dry weight basis for the first (01), second (12), and third (23) week of exposure to heavy metal stress.

View larger version (14K): [in a new window]   Fig. 2. Cadmium concentration (in mg kg–1 dry matter) in roots, stems, and leaves of Mediterranean saltbush exposed for 1, 2, and 3 wk to 0.1 mM Cd in nutrient solution. Each value is the mean of five replicates and vertical bars are standard errors. Note that the vertical scaling is not the same for roots and aerial parts.

View larger version (14K): [in a new window]   Fig. 3. Zinc concentration (in mg kg–1 dry matter) in roots, stems, and leaves of Mediterranean saltbush exposed for 1, 2, and 3 wk to 0.1 mM Zn in nutrient solution. Each value is the mean of five replicates and vertical bars are standard errors. Note that the vertical scaling is not the same for roots and aerial parts.

View larger version (18K): [in a new window]   Fig. 4. Total oxalate concentration (in µmol g–1 fresh matter) in roots, stems, and leaves of Mediterranean saltbush exposed for 1, 2, and 3 wk to either 0.1 mM Cd or Zn. Each value is the mean of three replicates and vertical bars are standard errors.

View larger version (26K): [in a new window]   Fig. 5. Reduced (GSH) and oxidized glutathione (GSSG) (in nmol g–1 fresh matter) in stems and leaves of Mediterranean saltbush exposed for 1, 2, and 3 wk to 0.1 mM Cd in nutrient solution. Each value is the mean of three replicates and vertical bars are standard errors. Note that vertical scaling is not the same for GSH and GSSG.