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.
journal_name
Chemospherejournal_title
Chemosphereauthors
Ghnaya T,Zaier H,Baioui R,Sghaier S,Lucchini G,Sacchi GA,Lutts S,Abdelly Cdoi
10.1016/j.chemosphere.2012.08.061subject
Has Abstractpub_date
2013-01-01 00:00:00pages
1449-54issue
4eissn
0045-6535issn
1879-1298pii
S0045-6535(12)01129-0journal_volume
90pub_type
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