Abstract
Zn stress seriously induces various toxic responses in Withania somnifera L., when accumulated above the threshold level which was confirmed by investigating the responses of protein, expression of antioxidant enzymes, and elemental profiling on accumulation of Zn. Zn was supplemented in the form of ZnSO4 (0, 25, 50, 100, and 200 μM) through MS liquid medium and allowed to grow the in vitro germinated plants for 7 and 14 days. The study revealed that when the application of Zn increased, a significant reduction of growth characteristics was noticed with alterations of proteins (both disappearance and de novo synthesis). The activity of CAT, SOD, and GPX were increased up to certain concentrations and then declined, which confirmed through in-gel activity under different treatments. RT-PCR was conducted by taking three sets of genes from CAT (RsCat, Catalase1, Cat1) and SOD (SodCp, TaSOD1.2, MnSOD) and found that gene RsCat from CAT and MnSOD from SOD have shown maximum expression of desired genes under Zn stress, which indicate plant’s stress tolerance mechanisms. The proton-induced X-ray emission study confirmed an increasing order of uptake of Zn in plants by suppressing and expressing other elemental constituents which cause metal homeostasis. This study provides insights into molecular mechanisms associated with Zn causing toxicity to plants; however, cellular and subcellular studies are essential to explore molecule-molecule interaction during Zn stress in plants.
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Abbreviations
- Zn:
-
Zinc
- MS:
-
Murashige and Skoog
- RT-PCR:
-
Reverse transcriptase polymerase chain reaction
- CAT:
-
Catalase
- SOD:
-
Superoxide dismutase
- PIXE:
-
Proton-induced X-ray emission
- ROS:
-
Reactive oxygen species
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- EDTA:
-
Ethylenediamine-tetraacetic acid
- GPX:
-
Guaiacol peroxidase
- POD:
-
Peroxidase
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Acknowledgements
The authors are grateful to the Director, Institute of Physics, Bhubaneswar, for providing PIXE facility to study the metal analysis.
Funding
This study received financial support from UGC-DAE Consortium for Scientific Research, Kolkata, India (Grant No. UGC-DAE-CSR-KC/CRS/2009/TE-01/1539).
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Rout, J.R., Kerry, R.G., Panigrahi, D. et al. Biochemical, molecular, and elemental profiling of Withania somnifera L. with response to zinc stress. Environ Sci Pollut Res 26, 4116–4129 (2019). https://doi.org/10.1007/s11356-018-3926-6
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DOI: https://doi.org/10.1007/s11356-018-3926-6