Enhanced lead accumulation in Sesbania drummondii by plant hormones
The effect of plant growth hormones indole-3-acetic acid (IAA) and naphthalene acetic acid (NAA) in the presence of ethyl-enediaminetetraacetic acid (EDTA) on growth and lead (Pb) uptake was studied in Sesbania drummondii. Plant growth was significantly inhibited at the treatments containing Pb+EDTA, and EDTA with lower concentrations (up to 10M) of IAA and NAA. At high concentration (100M) of IAA and NAA, growth was comparable to control plants (grown in the presence of Pb only). The F<,v>/F<,m> and F<,v>/F<,0> values of treated seedlings remained unaffected, indicating normal photosynthetic efficiency and strength in the presence of EDTA and IAA or NAA. Pb uptake in plant tissue was significantly enhanced in the presence of EDTA supplemented with IAA or NAA. Addition of EDTA in growth media increased Pb uptake in shoots by 350％ as compared to control plants. However, when EDTA was added along with 100M IAA and NAA, Pb uptake increased in shoots by 1,349％ and 1,252％, respectively, as compared to control plants. Scanning-electron microscopic observations revealed that lead particles in both leaf and stem of EDTA and EDTA+IAA or NAA treated plants were concentrated at the region of vascular bundles. Lead particles were also found in the root tissue from the epidermis layer to the stele region. The results of this study should be helpful to increase the metals accumulating potential of plants.
EDTA phytoremediation Pb toxicity plant hormone Sesbania drummondii
Shivendra V. Sahi Mohd. Israr Kenneth S. Sajwan
Department of Biology, Western Kentucky University, 1906 College Heights Blvd ＃ 11080, Bowling Green Department of Natural Science & Mathematics, Savannah State University, Savannah, GA 31404 USA
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
235-236
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）