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Modulation of antioxidant defense by exogenous compounds in cadmium-stressed chickpea seedlings

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Euro-Mediterranean Journal for Environmental Integration Aims and scope Submit manuscript

Abstract

The present study aimed to investigate the response of chickpea (Cicer arietinum L.) seedlings to increasing concentrations (0, 10, 50, 100, 200, 500, 1000 µM) of cadmium (Cd) and to explore the potential protective effects of exogenous effectors against Cd-induced toxicity. Exposure of the germinating seeds to Cd significantly hindered the growth of the embryonic axis, resulting in dose-dependent reductions in elongation and dry biomass production. The Cd-induced growth delay might be attributable to the alteration of cotyledonary reserve mobilization. To assess the impact of exogenous effectors, namely magnesium (MgCl2, 10 mM), ascorbic acid (ASC, 1 µM), ethylene diamine tetraacetic acid (EDTA, 100 µM), and citric acid (100 µM), seeds were pretreated by imbibition in effector solutions for 12 h or were exposed to a combination of 200 µM Cd along with the effectors for 6 days. Pretreatment with ASC and EDTA effectively mitigated Cd-induced growth inhibition, leading to 28% and 36% increases in epicotyl fresh weight, respectively, without affecting the radicle and epicotyl lengths. The combined treatment with Cd and exogenous effectors, particularly ASC and EDTA, was more efficient at ameliorating seedling growth. Furthermore, all tested effectors countered the Cd-induced accumulation of H2O2 in chickpea tissues when applied concomitantly with the metal. The ameliorating effect of exogenous ASC and EDTA on the cellular redox state appears to be correlated with the enhancement of ascorbate peroxidase (APX) activity and the upregulation of the expression of its encoding gene. Conversely, catalase (CAT) activity was reduced by effector application, while the expression of its encoding gene was upregulated by ASC treatment. Overall, the present findings highlight the efficacy of ASC and EDTA as the most effective exogenous agents in protecting germinating chickpea seeds from Cd-imposed growth reduction and oxidative stress.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are thankful to Professor Yoshiyuki Murata for providing gene primers.

Funding

This work was financially supported by the Tunisian Ministry of High Education and Scientific Research (LR18ES38).

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LS performed all laboratory experiments, statistically analyzed the data, and wrote the manuscript; AC supervised the experiments and revised the manuscript. All the authors have read and approved the final manuscript.

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Correspondence to Lamia Sakouhi.

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All authors declare that they have no conflict of interest.

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Responsible Editor: Angela Cunha.

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Sakouhi, L., Chaoui, A. Modulation of antioxidant defense by exogenous compounds in cadmium-stressed chickpea seedlings. Euro-Mediterr J Environ Integr 9, 127–139 (2024). https://doi.org/10.1007/s41207-023-00440-9

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  • DOI: https://doi.org/10.1007/s41207-023-00440-9

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