Abstract
Purpose
The current study investigated the effects of gamma irradiation on biochemical parameters and secondary metabolite accumulation in Summer Savory under field conditions.
Materials and methods
The dry seeds of Summer Savory (with a moisture content of 12%) were exposed to gamma radiation at the doses of 20, 40, 60, 80, and 100 Gy. Non-irradiated seeds (0 Gy) were used as control.
Results
Our findings showed that gamma radiation at low doses (20–40 Gy) had no effect on biochemical parameters and secondary metabolites accumulation in S. hortensis. These parameters are steadily and significantly increased by raising gamma irradiation doses from 40 to 100 Gy. The highest amount of chlorophyll a and b, carotenoids, anthocyanin, and total phenolic and flavonoid content were observed in 80 and 100 Gy treatments. Plants exposed to 80 and 100 Gy treatments accumulated the maximum amounts of rosmarinic acid and caffeic acid, respectively. Furthermore, the analysis of S. hortensis essential oil revealed that gamma radiation significantly alters its components. Carvacrol, α-Pinene, and α-Thujene levels raised dramatically compared to control with an increase in gamma irradiation dose from 20 to 100 Gy, while Thymol and α-Terpinene levels lowered.
Conclusions
Our results showed that treatment of Summer Savory seeds with gamma radiation at 80 and 100 Gy doses could significantly be raised biochemical parameters and secondary metabolites accumulation under field conditions. The current study showed that gamma irradiation could be used as a pre-sowing elicitor to improve the quantity and quality of phytochemicals in Summer Savory.
Acknowledgements
We are grateful to the Department of Horticulture Science and Landscape Architecture, University of Mohaghegh Ardabili, Ardabil, Iran, for providing the necessary laboratory facilities.
Author contributions
Neda Tariverdizadeh: Data curation, Investigation, Methodology, Writing- Original draft preparation. Mehdi Mohebodini: Conceptualization, Supervision, Writing- Reviewing and Editing. Asghar Ebadi: Software, Validation. Hamid Reza Heydari: Methodology, Data curation, Writing- Reviewing and Editing, Visualization.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Funding
Notes on contributors
Neda Tariverdizadeh
Neda Tariverdizadeh is a PhD student at the Faculty of Agriculture and Natural resources, University of Mohaghegh Ardabili, Ardabil, Iran.
Mehdi Mohebodini
Mehdi Mohebodini, PhD, is a Professor at the Faculty of Agriculture and Natural resources, University of Mohaghegh Ardabili, Ardabil, Iran.
Asghar Ebadi
Asghar Ebadi, PhD, is an Associate Professor at the Moghan College of Agriculture and Natural Resource, University of Mohaghegh Ardabili, Ardabil, Iran.
Hamid Reza Heydari
Hamid Reza Heydari received a doctorate from the University of Mohaghegh Ardabili in 2021.