Comparative study of Pb-phytoextraction potential in Sesuvium portulacastrum and Brassica juncea: tolerance and accumulation.
Lead phytoextraction from salty soils is a difficult task because this process needs the use of plants which are able to tolerate salt and accumulate Pb(2+) within in their shoots. It has recently been suggested that salt-tolerant plants are more suitable for heavy metals extraction than salt-sensitive ones commonly used in this approach. The aim of this study was to investigate Pb-phytoextraction potential of the halophyte Sesuvium portulacastrum in comparison with Brassica juncea commonly used in Pb-phytoextraction. Seedlings of both species were exposed in nutrient solution to 0, 200, 400, 800 and 1000 μM Pb(2+) for 21 days. Lead strongly inhibited growth in B. juncea but had no impact on S. portulacastrum. Exogenous Pb(2+) reduced nutrients uptake mainly in B. juncea as compared to S. portulacastrum. Lead was preferentially accumulated in roots in both species. S. portulacastrum accumulated more Pb(2+) in the shoot than B. juncea. Hence, the amounts of Pb(2+) translocated at 1000 μM Pb(2+) were 3400 μg g(-1) DW and 2200 μg g(-1) DW in S. portulacastrum and B. juncea, respectively. These results suggest that S. portulacastrum is more efficient to extract Pb(2+) than B. juncea.
Zaier
Hanen
H
Laboratoire d'Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie de Borj-Cédria, BP 901, 2050 Hammam-lif, Tunisia. hanen_zaer@yahoo.fr
Ghnaya
Tahar
T
Lakhdar
Abelbasset
A
Baioui
Rawdha
R
Ghabriche
Rim
R
Mnasri
Majda
M
Sghair
Souhir
S
Lutts
Stanley
S
Abdelly
Chedly
C
D035722:Aizoaceae / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D004305:Dose-Response Relationship, Drug; D007854:Lead / Q000493:pharmacokinetics*; D009149:Mustard Plant / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D010944:Plants; D055051:Salt-Tolerant Plants / Q000378:metabolism; D036226:Seedlings
D007854:Lead