Abstract
The potential of arsenic (As) tolerant and sensitive varieties of wheat (Triticum aestivum L.) has yet to be explored despite of alarming situation of arsenic toxicity. To fill this gap, the study aimed to explore the role of antioxidants, phytochelatins, and ascorbate–glutathione for As tolerance in wheat. A total of eight varieties were exposed to different arsenate treatments (0, 1, 5, 10, 50, 100, 200, 500, 1000, 2000, and 10,000 μM) initially to screen effective treatment as well as contrasting varieties via Weibull distribution frequency for further analysis. The Weibull analysis found 200 μM as the most effective treatment in the present study. Selected varieties were analyzed for accumulation of total As and As speciation, oxidative stress (malondialdehyde, hydrogen peroxide), antioxidants (superoxide dismutase, catalase, peroxidase), phytochelatins, and ascorbate–glutathione cycle (glutathione-S-transferase, glutathione reductase, glutathione peroxidase, ascorbate peroxidase). Tolerant varieties showed less accumulation and translocation of total As, arsenate, and arsenite to the shoots compared with sensitive varieties under 200 μM treatment. Low concentration in tolerant varieties correlated with better growth and development response. Tolerant varieties showed higher induction of metabolites (glutathione, phytochelatins) compared to sensitive ones. Furthermore, tolerant varieties showed better performance of antioxidant and ascorbate–glutathione cycle enzymes in response to As exposure. The findings of the present study provided great insight into the wheat tolerance mechanism upon As exposure between contrasting varieties.
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Acknowledgements
The authors are grateful to the International Research Support Initiative Program (IRSIP), Higher Education Commission (HEC), Pakistan, for providing fellowship (IRSIP 49 BMS 31) in the completion of this work. The authors are also grateful to Dr. Edouard Pesquet from the DEEP Department, at Stockholm University, Sweden, for his valuable guidance during the GSH-PCs analysis.
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MS was involved in investigation, writing—original draft, data curation, and formal analysis. UMQ assisted with methodology and conceptualization. TL provided technical assistance. MG was responsible for resources, methodology, reviewing and editing, and supervision. RNM participated in supervision, project administration, and writing—reviewing and editing.
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Saeed, M., Quraishi, U.M., Landberg, T. et al. Phenomic profiling to reveal tolerance mechanisms and regulation of ascorbate–glutathione cycle in wheat varieties (Triticum aestivum L.) under arsenic stress. Environ Geochem Health 46, 2 (2024). https://doi.org/10.1007/s10653-023-01784-5
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DOI: https://doi.org/10.1007/s10653-023-01784-5