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Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response

Thyme (Thymus spp.) volatiles predominantly consisting of monoterpenes and sesquiterpenes, serve as antimicrobial, antiseptic and antioxidant in phytomedicine. They also play a key role in plants as secondary metabolites via their potential role against herbivores, attracting pollinators and abiotic...

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Autores principales: Mahdavi, Atiyeh, Moradi, Parviz, Mastinu, Andrea
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7179171/
https://www.ncbi.nlm.nih.gov/pubmed/32121165
http://dx.doi.org/10.3390/molecules25051091
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author Mahdavi, Atiyeh
Moradi, Parviz
Mastinu, Andrea
author_facet Mahdavi, Atiyeh
Moradi, Parviz
Mastinu, Andrea
author_sort Mahdavi, Atiyeh
collection PubMed
description Thyme (Thymus spp.) volatiles predominantly consisting of monoterpenes and sesquiterpenes, serve as antimicrobial, antiseptic and antioxidant in phytomedicine. They also play a key role in plants as secondary metabolites via their potential role against herbivores, attracting pollinators and abiotic stress tolerance. Plant volatiles are affected by different environmental factors including drought. Here, the effect of prolonged water deficit stress on volatile composition was studied on the sensitive and tolerant thyme plant cultivars (T. vulgaris Var. Wagner and T. vulgaris Var. Varico3, respectively). Volatile sampling along with morpho–physiological parameters such as soil moisture, water potential, shoot dry weight, photosynthetic rate and water content measurements were performed on one-month-old plants subsequent to water withholding at 4-day intervals until the plants wilted. The tolerant and sensitive plants had clearly different responses at physiological and volatile levels. The most stress-induced changes on the plants’ physiological traits occurred in the photosynthetic rates, where the tolerant plants maintained their photosynthesis similar to the control ones until the 8th day of the drought stress period. While the analysis of the volatile compounds (VOCs) of the sensitive thyme plants displayed the same pattern for almost all of them, in the tolerant plants, the comparison of the pattern of changes in the tolerant plants revealed that the changes could be classified into three separate groups. Our experimental and theoretical studies totally revealed that the most determinant compounds involved in drought stress adaptation included α-phellandrene, O-cymene, γ-terpinene and β-caryophyelene. Overall, it can be concluded that in the sensitive plants trade-off between growth and defense, the tolerant ones simultaneously activate their stress response mechanism and continue their growth.
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spelling pubmed-71791712020-04-28 Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response Mahdavi, Atiyeh Moradi, Parviz Mastinu, Andrea Molecules Article Thyme (Thymus spp.) volatiles predominantly consisting of monoterpenes and sesquiterpenes, serve as antimicrobial, antiseptic and antioxidant in phytomedicine. They also play a key role in plants as secondary metabolites via their potential role against herbivores, attracting pollinators and abiotic stress tolerance. Plant volatiles are affected by different environmental factors including drought. Here, the effect of prolonged water deficit stress on volatile composition was studied on the sensitive and tolerant thyme plant cultivars (T. vulgaris Var. Wagner and T. vulgaris Var. Varico3, respectively). Volatile sampling along with morpho–physiological parameters such as soil moisture, water potential, shoot dry weight, photosynthetic rate and water content measurements were performed on one-month-old plants subsequent to water withholding at 4-day intervals until the plants wilted. The tolerant and sensitive plants had clearly different responses at physiological and volatile levels. The most stress-induced changes on the plants’ physiological traits occurred in the photosynthetic rates, where the tolerant plants maintained their photosynthesis similar to the control ones until the 8th day of the drought stress period. While the analysis of the volatile compounds (VOCs) of the sensitive thyme plants displayed the same pattern for almost all of them, in the tolerant plants, the comparison of the pattern of changes in the tolerant plants revealed that the changes could be classified into three separate groups. Our experimental and theoretical studies totally revealed that the most determinant compounds involved in drought stress adaptation included α-phellandrene, O-cymene, γ-terpinene and β-caryophyelene. Overall, it can be concluded that in the sensitive plants trade-off between growth and defense, the tolerant ones simultaneously activate their stress response mechanism and continue their growth. MDPI 2020-02-28 /pmc/articles/PMC7179171/ /pubmed/32121165 http://dx.doi.org/10.3390/molecules25051091 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mahdavi, Atiyeh
Moradi, Parviz
Mastinu, Andrea
Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response
title Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response
title_full Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response
title_fullStr Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response
title_full_unstemmed Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response
title_short Variation in Terpene Profiles of Thymus vulgaris in Water Deficit Stress Response
title_sort variation in terpene profiles of thymus vulgaris in water deficit stress response
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7179171/
https://www.ncbi.nlm.nih.gov/pubmed/32121165
http://dx.doi.org/10.3390/molecules25051091
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