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Abstract
There is little information on the impact of soil amendments on lead absorption by ornamental plants as phytoremediation and the antioxidant system. The experiment was set up in a factorial based on completely block design with three replications on Zinnia elegans. [Pb (NO3) at (0, 40, 80, and 120 mg kg−1), soil amendment (control, diethylene trinitrilo pentaacetic acid (DTPA) 2.5 mM, DTPA 5 mM, humic acid 200 mg. L−1, and HA 400 mg. L−1)]. Increased Pb concentration resulted in a significant rise in antioxidant enzymes, as well as an increase in Pb absorption by Z. elegans. DTPA 5 mM and HA 400 mg. L−1 application lead to significantly higher shoot dry weight (49 and 56%), root dry weight (62 and 63%), catalase (CAT) (18 and 19%), peroxidase (POX) (63 and 67%), superoxide dismutase (SOD) (10 and 14%), and shoot Pb (36 and 33 mg.kg−1) in the contaminated soil, respectively. With the application of DTPA and HA, the residual Pb in soil fell in a negative association with the remediation factor. Z. elegans growing in polluted soils treated with DTPA 5 mM and HA 400 mg. kg−1 showed Pb tolerance by inducing an effective antioxidative response to Pb toxicity and enhancing Pb absorption for phytoremediation purposes.
Disclosure statement
There are no conflicts of interest by authors.