Strigolactone and Methyl Jasmonate-Induced Antioxidant Defense and the Composition Alterations of Different Active Compo
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Strigolactone and Methyl Jasmonate‑Induced Antioxidant Defense and the Composition Alterations of Different Active Compounds in Dracocephalum kotschyi Boiss Under Drought Stress Siamak Shirani Bidabadi1 · Parisa Sharifi2 Received: 3 October 2019 / Accepted: 24 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Strigolactone (SL) and methyl jasmonate (MeJA) are one of the most important plant hormones that exert biological activity in plant responses to environmental stresses. Considering the undetected role of SL in drought tolerance and essential oil yield of medicinal plants as well as conceivable interaction among MeJA and SL, a factorial experiment was performed as a complete randomized design with three replications. Experimental factors including two irrigation regimes such as irrigation to 80% field capacity (control) and 40% field capacity (drought stress) and spraying treatments include MeJA (0 and 0.5 mM) and SL (0 and 10 μM) were applied. Treatment of plants with SL and MeJA resulted in higher tolerance to drought stress due to higher fresh and dry weights as well as lower electrolyte leakage, malondialdehyde, H 2O2, total phenol content, total antioxidant activity and antioxidant power assay. The most important essential oil constituents of D. kotschyi included geranyl acetate (41.1–48.6%), α-pinene (16.2–18.9%), geranial (7.9–10.1%), limonene (5.5–7.0%), neral (3.5–4.1%), methyl geranate (2.3–3.3%) and geraniol (1–2.2%), the least of which was found in non-MeJA- and SL-treated plants under drought and the highest in MeJA- and SL-treated plants under drought stress. Drought tolerance of D. kotschyi became more intense and the amount of essential oil components of water stressed plants was the highest (99.2%) when these plant hormones were used together. These results suggest a cross-link between MeJA and SL in improving drought resistance and optimizing the production of essential oil of D. kotschyi. Keywords Drought stress · GR24 · Methyl jasmonate · Oxidative stress · Photosynthesis · Strigolactone
Introduction Drought stress is considered as one of the major restrictive environmental factors in plant growth and yield which generates modifications at physiological and metabolic levels (Abass and Mohamed 2011; Hassan and Ali 2014; Tardieu et al. 2018). However, plants can acclimate to drought stress through maintaining optimum water status by various
* Siamak Shirani Bidabadi [email protected]; [email protected] Parisa Sharifi [email protected] 1
Department of Horticulture, College of Agriculture, Isfahan University of Technology, Isfahan 84156‑83111, Iran
Department of Agricultural Extension and Education, Higher Education Center Shahid Bakeri Miyandoab, Urmia University, Urmia 94171‑71946, Iran
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physiological and biochemical changes (Mohamed and Akladious 2014; Xavier et al. 2019). Not only are genetic factors and developmental stage controlling the production of the essential oil production, but environmental factors can aff
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