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Lead Tolerance and its Accumulation by a Tree Legume: Dalbergia sissoo DC

Kaur, Inderpal, Jadhav, Shailesh K., Tiwari, K. L., Quraishi, Afaque
Bulletin of environmental contamination and toxicology 2018 v.101 no.4 pp. 506-513
Dalbergia sissoo, ascorbate peroxidase, catalase, citric acid, energy-dispersive X-ray analysis, forest trees, genomics, lead, legumes, phytoremediation, polluted soils, proline, roots, scanning electron microscopy, tissues, toxicity, tropical wood, vegetative growth
Dalbergia sissoo DC, a leguminous tropical timber tree has been investigated against the Pb toxicity; under the Pb-stress, plant’s morphology, biochemical parameters and genomic template stability (GTS) screened in vitro. At the optimum Pb tolerance level (150 mg L⁻¹), plant’s defense mechanism—superoxide dismutase, catalase, ascorbate peroxidases and proline could trigger to achieve optimum vegetative growth with minimum fluctuations of the GTS. Further, D. sissoo roots could accumulate 2399.8 ± 16 mg kg⁻¹ Pb. Scanning electron microscopy and energy dispersive X-ray spectrometer analysis also revealed the deposition of Pb in root tissues. In a 1 year pot experiment with Pb-contaminated soil, the plants exhibited normal growth, and Pb accumulation significantly enhanced by the amalgamation of citric acid in the soil. Thus, the tree may prove as a potential candidate for Pb phytostabilization.