Abstract
Increased dependence on thermal power has resulted in a significant increase in the generation of fly ash (FA), which exacerbates environmental pollution. In order to mitigate this source of pollution, we propose covering FA dumps with a layer of planted vegetation. Due to varying degrees of tolerance and their sessile nature, plants are themselves susceptible to stress from pollution. This suggests that an investigation to assess the role of wild growing plants for management of FA dumps, where selected wild plants could be grown to mitigate consequences of FA. The present study assesses oxidative damage and the foliar concentration of metals in Withania somnifera growing wild at the Badarpur Thermal Power Plant (BTPP) compared to those growing at a control site. Plants growing at the BTPP showed significantly higher foliar concentrations of Pb, Mn, and Fe, and low concentrations of Ni and Cd. The plants at the BTPP site showed signs of oxidative stress as indicated by enhanced levels of malondialdehyde and electrolyte leakage from cells. The CO2 assimilation rate, net photosynthetic rate, rate of transpiration, stomatal conductance decrease, while water use efficiency, and air pollution tolerance index increase. Among air pollution tolerance index parameters, relative water content showed a significant increase with FA pollution stress at the BTPP. A significant decrease was observed in leaf morphology single leaf area, leaf length, and leaf width and biochemical parameters (Chlorophyll a, Chlorophyll b, total chlorophyll, and carotenoids. Moreover, FA pollution stress induces oxidative stress in W. somnifera through a significant and enhanced production of reactive oxygen species (ROS). According to our observations, the ability of W. somnifera to effectively coordinate superoxide dismutase, ascorbate peroxidase, and glutathione reductase activities involved in the scavenging of ROS along with the enhanced increment of nonenzyme activities (total ascorbic acid, proline, and oxidized glutathione) could be related to FA stress tolerance in W. somnifera.
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Abbreviations
- TPP:
-
Thermal power plant
- BTTP:
-
Badarpur thermal power plant
- JMI:
-
Jamia Millia Islamia
- FA:
-
Fly ash
- BA:
-
Bottom ash
- CEC:
-
Cation exchange capacity
- OM:
-
Organic matter
- Chl.:
-
Chlorophyll
- SLA:
-
Single leaf area
- LL:
-
Leaf length
- LW:
-
Leaf width
- tAsA:
-
Total ascorbic acid
- FW:
-
Fresh weight
- DW:
-
Dry weight
- TW:
-
Turgid weight
- RWC:
-
Relative water content
- APTI:
-
Air pollution tolerance index
- pn :
-
Net photosynthetic rate
- Gs :
-
Stomatal conductance
- A :
-
CO2 assimilation rate
- E :
-
Transpiration rate
- WUE:
-
Water use efficiency
- O2 · − :
-
Superoxide radical
- H2O2 :
-
Hydrogen peroxide
- MDA:
-
Malondialdehyde
- EL:
-
Electrolytic leakage
- SOD:
-
Superoxidase dismutase
- APX:
-
Ascorbate peroxidase
- GR:
-
Glutathione reductase
- MDHAR:
-
Monodehydroascorbate reductase
- DHAR:
-
Dehydroascorbate reductase
- tGSH:
-
Total glutathione
- GSH:
-
Reduced glutathione
- GSSG:
-
Oxidized glutathione
- DHA:
-
Dehydroascorbate
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Acknowledgements
Z. H khan from IIT Delhi and faculty members of AIRF Jawaharlal Nehru University are highly acknowledged for providing necessary facilities for conducting this work. The authors would like to extend their sincere appreciation to the Researchers Supporting Project Number (RSP-2020/180), King Saud University, Riyadh, Saudi Arabia.
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SUQ, VR, WAS outlined the experimental setup. SUQ, VR, WAS wrote the initial draft of the manuscript. MNA and PA analyzed the data. MNA and PA revised the manuscript to the present form. The manuscript was read by all authors and approved for submission.
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Qadir, S.U., Raja, V., Siddiqui, W.A. et al. Foliar Concentrations of Selected Elements, Assessment of Oxidative Stress Markers and Role of Antioxidant Defense System is Associated with Fly Ash Stress Tolerance in Withania somnifera. J Plant Growth Regul 40, 1450–1465 (2021). https://doi.org/10.1007/s00344-020-10200-6
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DOI: https://doi.org/10.1007/s00344-020-10200-6