Abstract
The individual impact of silicon (Si) and nitric oxide (NO) on secondary metabolism in several plant species has been reported, but their combined effect has never been evaluated yet. Therefore, in this study, single and combined impacts of NO and Si on the biosynthesis of rosmarinic acid (RA) and essential oil (EO) content in leaves of Salvia officinalis were investigated under both non-stress and Cu stress conditions. The results indicated that high Cu concentration decreased biomass and the content of polyphenols, but elevated electrolyte leakage, while lower Cu concentrations, especially 200 μM Cu, increased the content of polyphenols, EO, and antioxidant capacity in leaves of S. officinalis. The foliar application of sodium silicate (1 mM Si) and sodium nitroprusside (200 μM SNP as a NO donor) alone and particularly in combination improved shoot dry biomass, restored chlorophyll and carotenoids, increased EO content, the amounts of flavonoids, and phenolic compounds especially RA, and enhanced antioxidant capacity in the leaves of S. officinalis under both non-stress and Cu stress conditions. Copper treatment increased NO content, upregulated expression of PAL, TAT, and RAS genes, and enhanced phenylalanine ammonia-lyase activity in the leaves, which were responsible for improving the production of phenolic compounds, particularly rosmarinic acid. Foliar spraying with Si and SNP intensified these attributes. All responses were more pronounced when NO and Si were simultaneously applied under Cu stress. These findings suggest that NO and Si synergistically modulate secondary metabolism through upregulation of related gene expression and enzyme activities under both non-stress and Cu stress conditions.
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Acknowledgements
The authors would like to thank the Plant Science Department of Shahrekord University, Iran, for financial support of this research and Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran, for laboratory services. The authors also thank Dr. Farhad Ghavami for English editing of the manuscript.
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This study was funded by the Plant Science Department of Shahrekord University, Iran.
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Pariya Pirooz: investigation, methodology, data analysis, writing.
Rayhaneh Amooaghaie: supervision, conceptualization, visualization, methodology, writing.
Ali-Mohammad Ahadi: genetic analysis, visualization, supervision, reviewing.
Fariba Sharififar: HPLC analysis, methodology, reviewing.
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Pirooz, P., Amooaghaie, R., Ahadi, A. et al. Silicon and nitric oxide synergistically modulate the production of essential oil and rosmarinic acid in Salvia officinalis under Cu stress. Protoplasma 259, 905–916 (2022). https://doi.org/10.1007/s00709-021-01708-z
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DOI: https://doi.org/10.1007/s00709-021-01708-z