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Version 3.24
Publication Type J
Authors Al Hassan, M., E. Estrelles, P. Soriano, M. P. Lopez-Gresa, J. M. Belles, M. Boscaiu and O. Vicente
Title Unraveling Salt Tolerance Mechanisms in Halophytes: A Comparative Study on Four Mediterranean Limonium Species with Different Geographic Distribution Patterns
Source Frontiers in Plant Science
Author Keywords climate change ion transport osmolytes salinity tolerance salt glands salt marsh salt stress seed germination salinity tolerance seed-germination water relations free proline developmental-stages quaternary ammonium higher-plants stress temperature growth
Abstract We have performed an extensive study on the responses to salt stress in four related Limonium halophytes with different geographic distribution patterns, during seed germination and early vegetative growth. The aims of the work were twofold: to establish the basis for the different chorology of these species, and to identify relevantmechanisms of salt tolerance dependent on the control of ion transport and osmolyte accumulation. Seeds were germinated in vitro, in the presence of increasing NaCl concentrations, and subjected to "recovery of germination" tests; germination percentages and velocity were determined to establish the relative tolerance and competitiveness of the four Limonium taxa. Salt treatments were also applied to young plants, by 1-month irrigation with NaCl up to 800 mM; then, growth parameters, levels of monovalent and divalent ions (in roots and leaves), and leaf contents of photosynthetic pigments and common osmolytes were determined in control and stressed plants of the four species. Seed germination is the most salt-sensitive developmental phase in Limonium. The different germination behavior of the investigated species appears to be responsible for their geographical range size: L. narbonense and L. virgatum, widespread throughout the Mediterranean, are the most tolerant and the most competitive at higher soil salinities; the endemic L. santapolense and L. girardianum are the most sensitive and more competitive only at lower salinities. During early vegetative growth, all taxa showed a strong tolerance to salt stress, although slightly higher in L. virgatum and L. santapolense. Salt tolerance is based on the efficient transport of Na+ and Cl- to the leaves and on the accumulation of fructose and proline for osmotic adjustment. Despite some species-specific quantitative differences, the accumulation patterns of the different ions were similar in all species, not explaining differences in tolerance, except for the apparent activation of K+ transport to the leaves at high external salinity, observed only in the most tolerant L. narbonenseand L. virgatum. This specific response may be therefore relevant for salt tolerance in Limonium. The ecological implications of these results, which can contribute to a more efficient management of salt marshes conservation/regeneration programs, are also discussed.
Author Address [Al Hassan, Mohamad; Lopez-Gresa, Maria P.; Belles, Jose M.; Vicente, Oscar] Univ Politecn Valencia, CSIC, Inst Biol Mol & Celular Plantas, Valencia, Spain. [Estrelles, Elena; Soriano, Pilar] Univ Valencia, Jardin Bot ICBiBE, Valencia, Spain. [Boscaiu, Monica] Univ Politecn Valencia, Inst Agroforestal Mediterraneo, Valencia, Spain. [Al Hassan, Mohamad] New Zealand Inst Plant & Food Res Ltd, Auckland, New Zealand. Vicente, O (reprint author), Univ Politecn Valencia, CSIC, Inst Biol Mol & Celular Plantas, Valencia, Spain. ovicente@ibmcp.upv.es
ISSN 1664-462X
ISBN 1664-462X
29-Character Source Abbreviation Front. Plant Sci.
Publication Date Aug
Year Published 2017
Volume 8
Digital Object Identifier (DOI) 10.3389/fpls.2017.01438
Unique Article Identifier WOS:000407911300001
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