The effect of water deficiency stress and citrulline on essential oil content, ‎photosynthetic pigments and chlorophyll fluorescence of hyssop (Hyssopus ‎officinalis L.) in different harvests

Document Type : Full Paper

Authors

1 M. Sc. Student,, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran‎

2 Professor, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran‎

3 Associate Professor, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran‎

4 Assistant Professor, Faculty of Agriculture, University of Maragheh, Maragheh, Iran‎

Abstract

In the present study, effects of exogenous citrulline (control, 1 mM and 2 mM) and water availability (100% WA, 50% WA and 25% WA) on growth indices, health of photosynthetic system, and essential oils quantity of hyssop were examined in two successive harvests (summer and autumn, 2019). Extraction of essential oils and determination of its content was performed by using clevenger-type apparatus in full blossoming stage. Analysis of variance showed that essential oil content, fresh weight, leaf area, plant height, total chlorophylls, and Fv/Fm indicator were decreased under severe water deficit stress (25% WA). Although citrulline doesn’t have a significant effect on essential oil content, citrulline at 2 mM could increase essential oil content under severe water deficit stress by about 15% and 30% in the first and second harvest, respectively. According to mean comparison, citrulline employment at 2 mM could significantly improve total chlorophyll content, anthocyanines content, relative water content and Fv/Fm indicator under severe water deficit stress. Overall, results of experiment corroborate that citrulline in low concentrations can economically collaborate as a metabolic agent in improving the essential oil content and growth parameters of hyssop.

Keywords


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