TITLE:
Phytoextraction of Trace Metals (Cd, Ni and Pb) by Panicum maximum Grown on Natural Soil
AUTHORS:
Hogban Coulibaly, Pétémanagnan Jean-Marie Ouattara, Aman Messou, Lacina Coulibaly
KEYWORDS:
Phytoextraction, Panicum maximum, Trace Metals, Bioaccumulation Factor, Transfer Factor
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.11 No.8,
August
30,
2021
ABSTRACT: This study aims to assess the effective capacity of Panicum maximum to accumulate cadmium
(Cd), nickel (Ni) and lead (Pb). P. maximum observed in a greenhouse was subjected to 2 ppm of Cd, 50
ppm of Ni, 100 ppm of Pb contaminated soil and uncontaminated soil, for 120 days. Plant growth and biomass produced concentration of trace
metals in soil and plant, bioaccumulation and transfer factors, location of
potentially toxic elements in tissues and cells of plant have been
determined. Stem length and biomass produced by P. maximum were higher on the uncontaminated soil followed
respectively by those of soil-contaminated by Pb, Cd and Ni. Bioaccumulation
factors of trace metals were 8.93 (Pb), 8.47 (Ni) and 3.37 (Cd). Ni was more
accumulated in shoot biomass (FT > 1), while Pb and Cd were concentrated in
root biomass (FT 1). Pb is accumulated preferentially in endodermis
(roots) and epidermis (leaves). As for Ni and Cd, they are concentrated in
central cylinder of roots and in conductive bundles of leaves. At cellular
level, Ni and Cd are mainly concentrated in intracellular compartments of
leaves and roots, while Pb is strongly detected at cell walls.