Chitosan-Mediated Changes in dry Matter, Total Phenol Content and Essential Oil Constituents of two Origanum Species und
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ORIGINAL ARTICLE / ORIGINALBEITRAG
Chitosan-Mediated Changes in dry Matter, Total Phenol Content and Essential Oil Constituents of two Origanum Species under Water Deficit Stress Hamid Mohammadi1 · Leila Aghaee Dizaj1 · Ahmad Aghaee2 · Mansour Ghorbanpour3 Received: 19 July 2020 / Accepted: 19 November 2020 © Springer-Verlag GmbH Deutschland, ein Teil von Springer Nature 2020
Abstract Origanum is one of the most important medicinal plants used worldwide due to the economic importance, quantity and quality of essential oil and antioxidant properties. Drought is one of the major abiotic stresses that cause deleterious damage to plants. As a bio-elicitor, chitosan prevents severe damage to plants under stress conditions by triggering plant defense mechanisms. To investigate the effects of chitosan application and water deficit stress on growth, yield and secondary metabolites of origanum, a greenhouse study was performed in a factorial experiment based on randomized complete block design (RCBD) with three replications. The studied factors consisted of foliar application of chitosan at three levels (0, 250 and 500 mg/L), under well-watered and water deficit stress conditions in two origanum species (Origanum majorana and Origanum vulgare). The application of water deficit stress and foliar treatment with chitosan (three steps) was performed three weeks before flowering. Results showed that the water deficit stress reduced the plant dry weight, while increased total phenol and essential oil contents. However, foliar application of chitosan at 500 mg/L under water deficit stress conditions increased dry weight of shoots, and phenol content. Application of chitosan at 250 mg/L increased the content of essential oil compared to the control. Results also showed that application of chitosan as a bio-elicitor can reduce the adverse effects of water deficit stress on marjoram plant. The analysis of GC/MS apparatus revealed that 33 compounds were identified in essential oil, in which γ-terpinene, cis-sabinene hydrate and terpinolene were the dominant in the oil of both origanum species.
Keywords Origanum species · Chitosan · Drought stress · Secondary metabolites · Linalool
Hamid Mohammadi
[email protected] Mansour Ghorbanpour
[email protected] 1
Faculty of Agriculture, Azarbaijan Shahid Madani University, Tabriz, Iran
2
Department of Biology, Faculty of Science, University of Maragheh, Maragheh, Iran
3
Department of Medicinal Plants, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran
K
H. Mohammadi et al.
Chitosan-vermittelte Veränderungen der Trockenmasse, des Gesamtphenolgehalts und der ätherischen Ölbestandteile zweier Origanum-Arten unter Wasserstress Zusammenfassung Origanum-Arten zählen aufgrund der wirtschaftlichen Bedeutung, der Menge und Qualität des ätherischen Öls und der antioxidativen Eigenschaften zu den wichtigsten weltweit verwendeten Heilpflanzen. Trockenheit ist eine der größten abiotischen Belastungen, die Schäden an Pflanzen verursachen. Chitosan ver
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