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Streptomyces pactum assisted phytoremediation in Zn/Pb smelter contaminated soil of Feng County and its impact on enzymatic activities

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ABSTRACT

Anthropogenic activities, such as industrial expansion, smelting, mining and agricultural practices, have intensified the discharge of potentially toxic trace elements (PTEs) into the environment, threatening human health and other organisms. To assist phytoremediation by sorghum in soil contaminated by smelters/mines in Feng County (FC), a pot experiment was performed to examine the phytoremediation potential of Streptomyces pactum (Act12) + biochar. The results showed that root uptake of Zn and Cd was reduced by 45 and 22%, respectively, while the uptake of Pb and Cu increased by 17 and 47%, respectively. The shoot and root dry weight and chlorophyll content improved after Act12 inoculation. β-glucosidase, alkaline phosphatase and urease activities in soil improved and antioxidant activities (POD, PAL, PPO) decreased after application of Act12 + biochar due to a reduction in stress from PTEs. BCF, TF and MEA confirmed the role of Act12 in the amelioration and translocation of PTEs. PCA analysis showed a correlation between different factors that affect the translocation of PTEs. Overall, Act12 promoted the phytoremediation of PTEs. Field experiments on Act12 + biochar may provide new insights into the rehabilitation and restoration of soils contaminated by mines.

No MeSH data available.


PCA analysis of different factors affecting PTEs translocation in Sorghum bicolor.Elements with Sh represents the shoot elements, Rt represents the root elements, POD, PAL, PPO are plant antioxidants, while Glu, Alp and Ure are soil enzymes.
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f7: PCA analysis of different factors affecting PTEs translocation in Sorghum bicolor.Elements with Sh represents the shoot elements, Rt represents the root elements, POD, PAL, PPO are plant antioxidants, while Glu, Alp and Ure are soil enzymes.

Mentions: Principal component analysis (PCA) is a data reduction procedure (metals concentration, other parameters of the soil or plants) applied to model large-scale data and can provide an easy visualization of latent relationships (principal components) among variables in large and complex datasets64. PCA was performed to draw a relationship between different factors (metal uptake, enzymatic activity of soil and plant) that can assist the translocation of PTEs and their effect on sorghum grown in mining sites30. The translocation of PTEs in sorghum depends on the agrochemical characteristics of soil, that is, the soil pH, EC and clay content65. The PCA results for all experimental parameters are shown in Fig. 7. Soil extractable Cd and MDA showed a very close correlation that affected plant growth and development. Cd can cause higher production of ROS and increase the MDA content, which can eventually lead to plant death49. The Cu content in the soil was low, and higher shoot biomass and soil EC facilitated Cu translocation in the sorghum shoots. As mentioned, Cu ions are released from the PMC and translocated into the sorghum shoots. Plant enzymes, such as POD, PAL and PPO, were also influenced by the soil pH and Cd translocation in roots. The plant enzymatic content linearly decreased with the concentration of Cd in soil, showing that stress was reduced after the uptake of Cd by sorghum57.


Streptomyces pactum assisted phytoremediation in Zn/Pb smelter contaminated soil of Feng County and its impact on enzymatic activities
PCA analysis of different factors affecting PTEs translocation in Sorghum bicolor.Elements with Sh represents the shoot elements, Rt represents the root elements, POD, PAL, PPO are plant antioxidants, while Glu, Alp and Ure are soil enzymes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384225&req=5

f7: PCA analysis of different factors affecting PTEs translocation in Sorghum bicolor.Elements with Sh represents the shoot elements, Rt represents the root elements, POD, PAL, PPO are plant antioxidants, while Glu, Alp and Ure are soil enzymes.
Mentions: Principal component analysis (PCA) is a data reduction procedure (metals concentration, other parameters of the soil or plants) applied to model large-scale data and can provide an easy visualization of latent relationships (principal components) among variables in large and complex datasets64. PCA was performed to draw a relationship between different factors (metal uptake, enzymatic activity of soil and plant) that can assist the translocation of PTEs and their effect on sorghum grown in mining sites30. The translocation of PTEs in sorghum depends on the agrochemical characteristics of soil, that is, the soil pH, EC and clay content65. The PCA results for all experimental parameters are shown in Fig. 7. Soil extractable Cd and MDA showed a very close correlation that affected plant growth and development. Cd can cause higher production of ROS and increase the MDA content, which can eventually lead to plant death49. The Cu content in the soil was low, and higher shoot biomass and soil EC facilitated Cu translocation in the sorghum shoots. As mentioned, Cu ions are released from the PMC and translocated into the sorghum shoots. Plant enzymes, such as POD, PAL and PPO, were also influenced by the soil pH and Cd translocation in roots. The plant enzymatic content linearly decreased with the concentration of Cd in soil, showing that stress was reduced after the uptake of Cd by sorghum57.

View Article: PubMed Central - PubMed

ABSTRACT

Anthropogenic activities, such as industrial expansion, smelting, mining and agricultural practices, have intensified the discharge of potentially toxic trace elements (PTEs) into the environment, threatening human health and other organisms. To assist phytoremediation by sorghum in soil contaminated by smelters/mines in Feng County (FC), a pot experiment was performed to examine the phytoremediation potential of Streptomyces pactum (Act12) + biochar. The results showed that root uptake of Zn and Cd was reduced by 45 and 22%, respectively, while the uptake of Pb and Cu increased by 17 and 47%, respectively. The shoot and root dry weight and chlorophyll content improved after Act12 inoculation. β-glucosidase, alkaline phosphatase and urease activities in soil improved and antioxidant activities (POD, PAL, PPO) decreased after application of Act12 + biochar due to a reduction in stress from PTEs. BCF, TF and MEA confirmed the role of Act12 in the amelioration and translocation of PTEs. PCA analysis showed a correlation between different factors that affect the translocation of PTEs. Overall, Act12 promoted the phytoremediation of PTEs. Field experiments on Act12 + biochar may provide new insights into the rehabilitation and restoration of soils contaminated by mines.

No MeSH data available.