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Open AccessArticle

Insights on Salt Tolerance of Two Endemic Limonium Species from Spain

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Instituto Agroforestal Mediterráneo (IAM), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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Centro para la Investigación y Experimentación Forestal, CIEF-Wildlife Service, Generalitat Valenciana, Avda Comarques del País Valencia,114, 46930 Quart de Poblet, Valencia, Spain
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Instituto de Biología Molecular y Celular de Plantas (IBMCP), Universitat Politècnica de València - Consejo Superior de Investigaciones Científicas (CSIC), Camino de Vera s/n, 46022 Valencia, Spain
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Instituto de Investigación para la Gestión Integrada de Zonas Costeras. (IGIC), Universidad Politècnica de València. C/ Paranimf 1, 46730 Gandia, Valencia, Spain
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Instituto de Conservación y Mejora de la Agrodiversidad Valenciana (COMAV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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Author to whom correspondence should be addressed.
Metabolites 2019, 9(12), 294; https://doi.org/10.3390/metabo9120294
Received: 27 October 2019 / Revised: 23 November 2019 / Accepted: 27 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Metabolomics in Plant Environmental Physiology)
We have analysed the salt tolerance of two endemic halophytes of the genus Limonium, with high conservation value. In the present study, seed germination and growth parameters as well as different biomarkers—photosynthetic pigments, mono and divalent ion contents—associated to salt stress were evaluated in response to high levels of NaCl. The study was completed with an untargeted metabolomics analysis of the primary compounds including carbohydrates, phosphoric and organic acids, and amino acids, identified by using a gas chromatography and mass spectrometry platform. Limonium albuferae proved to be more salt-tolerant than L. doufourii, both at the germination stage and during vegetative growth. The degradation of photosynthetic pigments and the increase of Na+/K+ ratio under salt stress were more accentuated in the less tolerant second species. The metabolomics analysis unravelled several differences between the two species. The higher salt tolerance of L. albuferae may rely on its specific accumulation of fructose and glucose under high salinity conditions, the first considered as a major osmolyte in this genus. In addition, L. albuferae showed steady levels of citric and malic acids, whereas the glutamate family pathway was strongly activated under stress in both species, leading to the accumulation of proline (Pro) and γ-aminobutyric acid (GABA). View Full-Text
Keywords: Limonium albuferae; Limonium dufourii; growth parameters; photosynthetic pigments; ionic homeostasis; metabolic profiles; carbohydrates; organic acids; amino acids; multivariate analysis Limonium albuferae; Limonium dufourii; growth parameters; photosynthetic pigments; ionic homeostasis; metabolic profiles; carbohydrates; organic acids; amino acids; multivariate analysis
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González-Orenga, S.; Ferrer-Gallego, P.P.; Laguna, E.; López-Gresa, M.P.; Donat-Torres, M.P.; Verdeguer, M.; Vicente, O.; Boscaiu, M. Insights on Salt Tolerance of Two Endemic Limonium Species from Spain. Metabolites 2019, 9, 294.

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