Document Type : Research Paper

Authors

1 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Azarbaijan Shahid Madani University, Tabriz, Iran.

2 Department of Plant Science and Medicinal Herbs, Meshgin Shahr Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran

3 Department of Production Engineering and Plant Genetics, Faculty of Agriculture, Jahrom University, Jahrom, Iran.

Abstract

Objective: In order to investigate the response of sage to delayed planting, the present study was performed as a randomized complete block design with three replications in the Meshkin Shahr Faculty of Agriculture research farm in 2020.
Methods: The treatments were two planting dates including conventional planting date (as control) and delayed planting which were cultivated on May 5th and June 15th, respectively.
Results: The results showed that delayed planting-mediated high temperature significantly increased total phenol, total flavonoids, anthocyanin, essential oil yield, and antioxidant properties by 25, 44, 85, 80, and 39 percent, respectively and decreased plant height, leaf width, and shoot fresh and dry weight by 8, 13, 41 and 34 percent, respectively compared to control. There were also negative and significant correlations between plant fresh or dry weight and essential oil percentage as well as the other measured phytochemical constituents. In addition, some essential oil constituents including α-Thujone, β-Thujone, β-Pinene, Borneol, and Viridiflorol were increased by 23, 15, 28, 37, and 46, respectively under heat stress compared to the control.
Conclusion: In general, an increase in secondary metabolite in delayed planting treatment indicates that sage plants probably employed the strategy of allocating more photosynthetically fixed carbon to the biosynthesis of secondary metabolites to improve plant tolerance to high-temperature conditions via a decrease in reactive oxygen species production and/or increase in the scavenging potential of those radicles.

Keywords

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