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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

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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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Contributions

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.

Corresponding author

Correspondence to Parvaiz Ahmad.

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The authors declare that they have no conflicts of interest.

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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

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