Abstract
In this study, the relationship between heavy metals (HMs) concentrations in soils and several weeds including Cyclosorus parasiticus, Dicranopteris linearis, Pityrogramma calomelanos, and Pteris vittata in three mining sites (Cam Gia (Thai Nguyen city), Tan Long (Dong Hy district), and Ha Thuong (Dai Tu district)) in Thai Nguyen province, Vietnam, have been investigated. The levels of HMs varied among soil origins and showed the contaminations of As, Cu, and Pb in soil samples collected in Dong Hy and Dai Tu districts. In addition, the HM distribution and cocontamination phenomena in different soils significantly affected the HM residues and transportation abilities into different species as well as tissues. Moreover, based on the analysis of bioaccumulation factor (BF) and translocation factor (TF), C. parasiticus and D. linearis were found potentially for phytoextraction by roots, while P. calomelanos and P. vittata were suitable for hyperaccumulation in shoots and leaves. Consequently, the strongest antioxidant property by 1,1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion (SRSA) radical scavenging assays were demonstrated in the methanol root extracts of C. parasiticus and P. vittata, respectively. In conclusion, the correlation among HM in soils and tissues with antioxidant property allows us to hypothesize that the presence of these elements can enhance the antioxidant activity of plant extracts, suggesting to apply the weeds in phytoremediation as well as in phytomedicine.
Highlights
Heavy-metal (HM) pollution is raising alarms since they can cause massive development in industrialization and mining, especially in developing countries
C. parasiticus, D. linearis, P. calomelanos, and P. vittata are four ferns that dominate in mining sites in ai Nguyen province, Vietnam, in which the two latter weeds, P. calomelanos, and P. vittata, have been reported as strong arsenic hyperaccumulators [6, 13,14,15]
In order to explore the relationship between heavy-metal concentrations in the metalliferous soils on the heavy-metal uptake, capabilities of the corresponding local several dominant ferns including C. parasiticus, D. linearis, P. calomelanos, and P. vittata collected in the three mining sites in ai Nguyen province, Vietnam, were evaluated for their antioxidant activity via 1,1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion (SRSA) radical scavenging assays. e screening results can be a good start for further studies of the antioxidants which can be applied in the health industry
Summary
Heavy-metal (HM) pollution is raising alarms since they can cause massive development in industrialization and mining, especially in developing countries. Ese hyperaccumulators possess several antioxidative defense systems to scavenge toxic free radicals in order to protect themselves from the oxidative stress that is caused by HMs. Interestingly, many hyperaccumulators belong to pteridophytes that are important plants from a phylogenetic and evolutionary perspective [12]. C. parasiticus, D. linearis, P. calomelanos, and P. vittata are four ferns that dominate in mining sites in ai Nguyen province, Vietnam, in which the two latter weeds, P. calomelanos, and P. vittata, have been reported as strong arsenic hyperaccumulators [6, 13,14,15]. In order to explore the relationship between heavy-metal concentrations in the metalliferous soils on the heavy-metal uptake, capabilities of the corresponding local several dominant ferns including C. parasiticus, D. linearis, P. calomelanos, and P. vittata collected in the three mining sites in ai Nguyen province, Vietnam, were evaluated for their antioxidant activity via 1,1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion (SRSA) radical scavenging assays. We try to find out the relationship between antioxidant activity of plants and HMs levels in soil in order to incorporate the environment purpose and natural sources valorization
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