The effects of water deficit on the expression of monoterpene synthases and essential oils composition in Salvia ecotype
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RESEARCH ARTICLE
The effects of water deficit on the expression of monoterpene synthases and essential oils composition in Salvia ecotypes Sadrollah Ramezani1 • Alireza Abbasi2 • Sajjad Sobhanverdi2 • Abdolali Shojaeiyan1 Nima Ahmadi1
•
Received: 26 July 2019 / Revised: 18 September 2020 / Accepted: 1 October 2020 Ó Prof. H.S. Srivastava Foundation for Science and Society 2020
Abstract The medicinal sage plant (Salvia spp.), belonging to Lamiaceae family, is one of the most important medicinal and aromatic plants. The members of this genus are globally known due to its antimicrobial, antioxidant, astringent, spasmolytic, antihidrotic and specific sensorial properties. In this study, we investigated the potential impact of water deficit on transcript abundance, and essential oil composition of five major metabolites, i.e. 1–8 cineole, a–b-thujone, camphor, and borneol in three genotypes of Salvia spp. Results showed that relative expression of three genes and their corresponding metabolites increased together at three stages under drought condition, but the CS gene transcript decreased independently from 1,8-cineole in garden sage. Furthermore, borneol changed differently compared to the BS gene expression in control and drought treatment plants of S. reuterana (Yasuj). The competitive synthesis of ß-thujone, and a-thujone by SS gene were demonstrated in S. officinalis and Yasuj ecotype of S. reuterana; whereas, no change was observed for Urmia ecotype of S. reuterana. There was no precursor shortage to synthesis of borneol and camphor in garden sage; however increasing the BS led to high production of borneol and low camphor in S. reuterana under drought stress. As a mechanism, secondary metabolites enable the plants to cope with Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12298-020-00892-1) contains supplementary material, which is available to authorized users. & Alireza Abbasi [email protected] 1
Sistan and Baluchestan University, Zahedan, Iran
2
Department of Agronomy and Plant Breeding, University of Tehran, Karaj, Iran
unfavorable conditions, but genetic differences might affect the quantity and quality of these compounds. Keywords Salvia Sage a–b-thujone Monoterpene GC/MS Drought stress
Introduction Garden sage, Salvia officinalis L., is one of the broad-appealing herbal plants due to the presence of a vast amount of aromatic oils as well as compounds with valuable medicinal properties. This plant belongs to the genus Salvia and Lamiaceae family, one of the largest genus comprising about 900 species. Although garden sage is currently naturalized all around the world, this plant is native to the Middle East and Mediterranean regions (Czygan 2004; Ghorbani and Esmaeilizadeh 2017; Miura et al. 2001). Throughout history, this plant has been widely used in food, medicine, and beverage preparations because of its tasty and spicy flavor. Moreover, it has been considered as a preservative in the food industry thanks to its strong antimicrobial ac
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