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Int. J. Mol. Sci. 2017, 18(10), 2067; doi:10.3390/ijms18102067

Lipidomics Unravels the Role of Leaf Lipids in Thyme Plant Response to Drought Stress

1
Research Division of Natural Resources, Zanjan Agricultural and Natural Resources Research and Education Centre, AREEO, Zanjan 45331-47183, Iran
2
Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
3
Department of Chemistry, University of Mohaghegh Ardabili, Ardabil 56199-11367, Iran
4
Department of Agricultural and Environmental Sciences, Milan State University, 20133 Milan, Italy
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 30 July 2017 / Revised: 6 September 2017 / Accepted: 20 September 2017 / Published: 28 September 2017
(This article belongs to the Special Issue Metabolomics in the Plant Sciences 2017)
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Abstract

Thymus is one of the best known genera within the Labiatae (Lamiaceae) family, with more than 200 species and many medicinal and culinary uses. The effects of prolonged drought on lipid profile were investigated in tolerant and sensitive thyme plants (Thymus serpyllum L. and Thymus vulgaris L., respectively). Non-targeted non-polar metabolite profiling was carried out using Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry with one-month-old plants exposed to drought stress, and their morpho-physiological parameters were also evaluated. Tolerant and sensitive plants exhibited clearly different responses at a physiological level. In addition, different trends for a number of non-polar metabolites were observed when comparing stressed and control samples, for both sensitive and tolerant plants. Sensitive plants showed the highest decrease (55%) in main lipid components such as galactolipids and phospholipids. In tolerant plants, the level of lipids involved in signaling increased, while intensities of those induced by stress (e.g., oxylipins) dramatically decreased (50–60%), in particular with respect to metabolites with m/z values of 519.3331, 521.3488, and 581.3709. Partial least square discriminant analysis separated all the samples into four groups: tolerant watered, tolerant stressed, sensitive watered and sensitive stressed. The combination of lipid profiling and physiological parameters represented a promising tool for investigating the mechanisms of plant response to drought stress at non-polar metabolome level. View Full-Text
Keywords: lipidome; FT-ICR; water deficit; Thymus; stress physiology; lipid signaling lipidome; FT-ICR; water deficit; Thymus; stress physiology; lipid signaling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Moradi, P.; Mahdavi, A.; Khoshkam, M.; Iriti, M. Lipidomics Unravels the Role of Leaf Lipids in Thyme Plant Response to Drought Stress. Int. J. Mol. Sci. 2017, 18, 2067.

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