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Taurine modulates dynamics of oxidative defense, secondary metabolism, and nutrient relation to mitigate boron and chromium toxicity in Triticum aestivum L. plants

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Abstract

The present study was undertaken to appraise the efficacy of exogenous taurine in alleviating boron (B) and chromium (Cr) toxicity. Taurine protects cell membranes from lipid peroxidation due to its function as a ROS scavenger. However, there exists no report in the literature on the role of taurine in plants under abiotic stresses. The present investigation indicated the involvement of exogenous taurine in mediating plant defense responses under B and Cr toxicity. Wheat plants manifested a significant drop in growth, chlorophyll molecules, SPAD values, relative water content, nitrate reductase activity, and uptake of essential nutrients under B, Cr, and combined B-Cr toxicity. Plants showed significant oxidative damage due to enhanced cellular levels of superoxide radicals (O2•−), hydrogen peroxide (H2O2), malondialdehyde (MDA), relative membrane permeability, and activity of lipoxygenase (LOX). Additionally, a significant negative correlation existed in B and Cr levels with the uptake of essential nutrients. Taurine substantially improved growth, photosynthetic pigments, and nutrient uptake by regulating ROS scavenging, secondary metabolism, and ions homeostasis under stress. Taurine protected plants from the detrimental effects of B and Cr by upregulating the production of nitric oxide, hydrogen sulfide, glutathione, and phenolic compounds.

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Data availability

The datasets used in this study are available from the corresponding author on reasonable request.

Abbreviations

SOD:

Superoxide dismutase

NO:

Nitric oxide

POD:

Peroxidase

H2S:

Hydrogen sulfide

CAT:

Catalase

O2 •– :

Superoxide radical

H2O2 :

Hydrogen peroxide

B:

Boron

Cr:

Chromium

TSS:

Total soluble sugars

NRS:

Non-reducing sugars

Ca2 + :

Calcium

P:

Phosphorus

N:

Nitrogen

K+ :

Potassium

RMP:

Relative membrane permeability

LOX:

Lipoxygenase

MDA:

Malondialdehyde

GSH:

Glutathione

RWC:

Relative water content

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Acknowledgements

The authors greatly acknowledge the Higher Education Commission (HEC), Pakistan, for providing funds for the execution of this research under project no. 8345/Punjab/NRPU/R&D/HEC/2017.

Funding

The funds for the present research work were provided by HEC-funded project no. 8345/Punjab/NRPU/R&D/HEC/2017.

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Authors

Contributions

RR: conceptualization and visualization. MAA: writing—original draft, supervision, methodology, and funding acquisition. MUF: investigation, methodology, and visualization. MI, MHS, and SA: review and editing, conceptualization, and visualization. IH: methodology and investigation.

Corresponding author

Correspondence to Muhammad Arslan Ashraf.

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Conflict of interest

The authors declare no competing interests.s

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Responsible Editor: Gangrong Shi

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Ashraf, M.A., Rasheed, R., Hussain, I. et al. Taurine modulates dynamics of oxidative defense, secondary metabolism, and nutrient relation to mitigate boron and chromium toxicity in Triticum aestivum L. plants. Environ Sci Pollut Res 29, 45527–45548 (2022). https://doi.org/10.1007/s11356-022-19066-5

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  • DOI: https://doi.org/10.1007/s11356-022-19066-5

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