The effects of selenium (Se) on coleus (Coleus blumei Benth.) under lead (Pb) stress was investigated to determine possible mitigating mechanisms of Se. Coleus plants were exposed to 1.0mM Pb(NO3)2 and varying concentrations of Na2SeO3 for 21d. Application of 1.0mM Se changed well the pattern of biomass allocation and Pb distribution in different organs, decreased superoxide dismutase (SOD) and peroxidase (POD) activity in the roots, and acted as an antioxidant by inhibiting lipid peroxidation via increasing glutathione levels. Root catalase (CAT) only increased at the highest Se dose, and glutathione peroxidase (GPX) activities increased with Se concentration. The changes to root and leaf particles were observed by scanning electron microscopy and X-ray diffraction. Our results indicated Pb was tolerated by coleus plants through allocation plasticity, activation of antioxidant systems, and improvements in particle size and mineralogical effects. C. blumei blumei can be useful in phytoremediation of aquatic systems contaminated with Pb, especially with addition of low concentrations of Se.
Mianhao Hu, J. Y. (2013). Selenium Treatment Mitigates the Effect of Lead Exposure in Coleus Blumei Benth. Journal of Environmental & Analytical Toxicology, 03(06). https://doi.org/10.4172/2161-0525.1000191