Studies of foliar bioconcentration of metals by Veronia amygdalina in a model heavy metal-polluted soil

 

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Article Title: Studies of foliar bioconcentration of metals by Veronia amygdalina in a model heavy metal-polluted soil
Authors: Ikhajiagbe B., Musa S. I., Onguro J.
Affiliation: University of Benin, Edo State Nigeria, Faculty of Life Sciences, Department of Plant Biology and Biotechnology
Admiralty University of Nigeria Delta State Nigeria, Faculty of Science, Department of Biological Sciences
Abstract: The study was undertaken to investigate the capability of Vernonia amygdalina Delile to bioaccumulate heavy metals in a model heavy metal polluted (MHP) soil. Stems cuttings of V. amygdalina were planted in soils polluted with 15, 45, and 90 mg/kg concentrations of Cd and Pb and in combination. After 4 months, results showed a significant reduction in height of plants grown in MHP soils compared to the control (p<0.05). However, the number of primary root branches per plant significantly increased with exposure to MHP soils (31 – 49) compared to the control (29). Metal accumulation by V. amygdalina in MHP soil was significant. Phytoaccumulation efficiency of plant leaves was highest (11.47%) when metal concentration was least, compared to 2.34% efficiency of the test plant in 90 mg(Pb)/kg-polluted soil. The concentration of Cd in the leaves of V. amygdalina was 2.51 mg/kg compared to a residual soil concentration of 5.83mg/kg in the 15mg Cd-polluted soil. The amount of Cd lost in the soil was highest with higher soil metal concentration.
Keywords: model heavy metal soil, phytoremediation, phytoaccumulation, bitter leaf, bioconcentration
*Correspondence: Musa Saheed Ibrahim, Musa-biology@adun.edu.ng