Phytoremediation of lead by a wild,non-edible Pb accumulator Coronopus didymus (L.) Brassicaceae |
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Authors: | Gagan Preet Singh Sidhu Aditi Shreeya Bali Harminder Pal Singh Daizy R Batish Ravinder Kumar Kohli |
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Institution: | 1. Department of Environment Studies, Panjab University, Chandigarh , India;2. Department of Botany, Panjab University, Chandigarh , India;3. Central University of Punjab, Mansa Road, Bathinda , India |
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Abstract: | Coronopus didymus was examined in terms of its ability to remediate Pb-contaminated soils. Pot experiments were conducted for 4 and 6 weeks to compare the growth, biomass, photosynthetic efficiency, lead (Pb) uptake, and accumulation by C. didymus plants. The plants grew well having no visible toxic symptoms and 100% survivability, exposed to different Pb-spiked soils 100, 350, 1500, and 2500 mg kg?1, supplied as lead nitrate. After 4 weeks, root and shoot concentrations reached 1652 and 502 mg Pb kg?1 DW, while after 6 weeks they increased up to 3091 and 527 mg Pb kg?1 DW, respectively, at highest Pb concentration. As compared to the 4 week experiments, the plant growth and biomass yield were higher after 6 weeks of Pb exposure. However, the chlorophyll content of leaves decreased but only a slight decline in photosynthetic efficiency was observed on exposure to Pb at both 4 and 6 weeks. The Pb accumulation was higher in roots than in the shoots. The bioconcentration factor of Pb was > 1 in all the plant samples, but the translocation factor was < 1. This suggested C. didymus as a good candidate for phytoremediation of Pb-contaminated soils and can be used for future remediation purposes. |
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Keywords: | Accumulation bioconcentration factor Pb-contaminated soil remediation translocation factor |
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