Abstract:
:The internalized speciation of lead in roots and leaves of Sesbania drummondii, a lead hyperaccumulator, grown in lead nitrate solution was studied using x-ray absorption near-edge structure and extended x-ray absorption fine structure. Lead was predominantly present as lead acetate in both plant tissues. The other dominant forms of accumulation were lead-sulfur compounds. Whereas lead sulfate and sulfide were found in leaves, only lead sulfide was detected in root samples. These observations indicate that S. drummondii is able to biotransform lead nitrate in the nutrient solution to lead acetate and sulfate in its tissues. Complexation with acetate and sulfate may be a lead detoxification strategy in this plant. Transmission-electron microscopy revealed the pattern of lead distribution in and around the cells. Dense distributions of lead grains were detected in root cell walls and plasma membranes, whereas evidence for vacuolar transport of lead was noticed in the stem cells.
journal_name
Environ Toxicol Chemjournal_title
Environmental toxicology and chemistryauthors
Sharma NC,Gardea-Torresdey JL,Parsons J,Sahi SVdoi
10.1897/03-540subject
Has Abstractpub_date
2004-09-01 00:00:00pages
2068-73issue
9eissn
0730-7268issn
1552-8618journal_volume
23pub_type
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