Abstract
Purpose
Heavy metal toxicity poses severe threats to soil and crop productivity. Cadmium (Cd) toxicity disrupts plant metabolism, reducing growth and yield. Si has emerged as a potential element in the context of metal toxicity, playing a crucial role in the compartmentalization and immobilization of metal ions. This study explores the potential of foliar-applied Si to mitigate Cd toxicity in Raya (Brassica juncea L.).
Methods
Seedlings underwent Cd toxicity induction using CdCl2 (300 μM) along with control (0 μM) and were subjected to foliar Si application of Na2SiO3 (0 and 500 ppm). The impact on agronomic parameters, photosynthetic pigments, antioxidants (SOD, POD, CAT), and stress markers (H2O2, MDA, proline) was evaluated.
Results
Cd stress reduced agronomic parameters, while Si application, particularly in Super Raya, showed positive effects under stress and non-stress conditions. Photosynthetic pigments decreased in response to Cd stress, although Si had a significant effect. Biochemical attributes such as antioxidants (SOD, POD, and CAT) and stress markers (H2O2, MDA, and proline) increased, with positive effects shown in the Cd+Si treatment.
Conclusion
This study unveils the potential of foliar-applied Si to alleviate Cd-induced toxicity in Raya, offering novel insights into its impact on agronomic and physico-chemical attributes. Si application emerges as an effective strategy to limit Cd uptake in aerial parts of the plant, paving the way for future research in optimizing Si application for enhanced plant resilience to heavy metal stress.
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Data Availability
The datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.
Code Availability
Not applicable.
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Acknowledgements
The authors would like to thank the research group of Dr. Muhammad Arfan (late) for providing state-of-the-art facilities, research settings, glassware, and required chemicals in the Plant Physiology Laboratory, Department of Botany, University of Agriculture, Faisalabad.
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The authors did not receive support from any organization for the submitted work.
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AJ carried out the research work and drafted the original manuscript as part of her master’s thesis; GAN designed the experiment, performed statistical analysis of data, figures, and tables, and revised the manuscript; SY and AAM supervised the manuscript and critically reviewed its technical parameters; TA and HS collected and interpreted the data.
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Novelty Statement
This study unveils the novel potential of foliar-applied Si in ameliorating Cd toxicity in Raya genotypes, bridging a critical gap in sustainable crop management.
Highlights
i Demonstrates the effectiveness of Si in mitigating Cd-induced stress in Raya crops.
ii Provides novel insights into the physiological and biochemical responses of Raya genotypes to heavy metal toxicity.
iii Offers a sustainable strategy for enhancing crop resilience and productivity in contaminated environments.
iv Explores the synergistic interactions between Si application, Cd stress, and genetic variability.
v Signifies the relevance of our findings for sustainable agriculture and environmental protection.
Aqsa Jabeen and Ghulam Abbas Narejo should be considered the joint first author.
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Jabeen, A., Narejo, G.A., Mirbahar, A.A. et al. Effect of foliar-applied Si in alleviating cadmium toxicity to different Raya (Brassica Junceae L.) genotypes. Silicon (2024). https://doi.org/10.1007/s12633-024-02949-2
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DOI: https://doi.org/10.1007/s12633-024-02949-2