Abstract
Purpose
In the Earth’s crust, silicon (Si) is the most abundant element after oxygen, while, under salt stress, its role in the tolerance of aromatic and medicinal plants (AMPs) is not yet detailed. For this reason, in this study we evaluated the effect of exogenous Si on some tolerance-related parameters in salt-stressed fenugreek, as an important AMP.
Methods
3 mM of exogenous Si was applied to assess its impact on plant biomass and on some tolerance-related parameters in fenugreek (Trigonella foenum-graecum L.) grown under 150 mM NaCl stress.
Results
Results showed that salinity reduced growth parameters, relative water content, photosystem II efficiency, stomatal conductance and K+ and Ca2+ contents, while it increased the Na+ content, which could explain the obtained reduction in fenugreek growth and yield. However, Si supply reversed the depressive effects of salinity and improved fenugreek growth and yield. Adding exogenous Si also caused a significant reduction in Na+ content and increased K+ and Ca2+ concentrations. The content of malonyldialdehyd and hydrogen peroxide and the level of electrolyte leakage were significantly increased in salt-stressed fenugreek, while were significantly decreased after Si supplementation. The reduction in oxidative stress markers in Si-treated plants was correlated with a significant increase in both enzymatic and non-enzymatic antioxidant systems and an important accumulation of compatible solutes.
Conclusion
Therefore, exogenous Si was directly involved in the central defensive mechanisms to enhance salt tolerance of fenugreek, thus its application could be a promoting strategy to alleviate the damages of salinity on fenugreek growth and yield.
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Data Availability
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Acknowledgements
The authors are grateful to all those who participated in the elaboration of this study. We thank all the partners involved in ANPMA-CNRST-USMS Project. We also thank the administrative and technical staff of the Polydisciplinary Faculty of Beni-Mellal for their support.
Funding
This work was supported by the National Agency of Medicinal and Aromatic Plants (ANPMA-Morocco), National Center of Scientific Research (CNRST-Morocco) and Sultan Moulay Slimane University (USMS-Morocco), convention number:348/20.
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All authors contributed to the study conception. Methodology and data analysis were performed by Lamsaadi Nadia; El Moukhtari Ahmed and Ziati Irouane. Validation; Farissi Mohamed. The first draft of the manuscript was written by Lamsaadi Nadia. Revision and comment of the manuscript; Mouradi Mohammed, El Hassni Majida, Ghoulam Cherki and Farissi Mohamed. Supervision and funding acquisition; Farissi Mohamed. All authors read and approved the submitted version of the manuscript.
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Lamsaadi, N., El Moukhtari, A., Irouane, Z. et al. Beneficial role of exogenous silicon on yield, antioxidant systems, osmoregulation and oxidative stress in fenugreek (Trigonella foenum-graecum L.) under salinity stress. Silicon 15, 547–561 (2023). https://doi.org/10.1007/s12633-022-02034-6
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DOI: https://doi.org/10.1007/s12633-022-02034-6