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Publication Type J
Authors Pardo-Domenech, L. L., A. Tifrea, M. N. Grigore, M. Boscaiu and O. Vicente
Title Proline and glycine betaine accumulation in two succulent halophytes under natural and experimental conditions
Source Plant Biosystems
Author Keywords Plantago crassifolia Inula crithmoides climate change osmolytes salt stress salt tolerance plant salt tolerance maritima l dum salinity tolerance suaeda-maritima abiotic stress quaternary ammonium compatible solutes osmotic adjustment water relations growth
Abstract Proline (Pro) and glycine betaine (GB) contents were determined in two Mediterranean halophytes, Plantago crassifolia and Inula crithmoides, to assess their possible role in salt tolerance of both taxa. Plant material was collected in a littoral salt marsh under different environmental conditions, and from plants subjected to salt treatments in a growth chamber. Relative growth inhibition by NaCl indicated that I. crithmoides is more salt-tolerant than P. crassifolia, in agreement with the distribution of the two species in nature. Field and laboratory data confirmed GB as the major osmolyte responsible for osmotic adjustment in I. crithmoides, but with only a minor role - if any - as "osmoprotectant" in the salt tolerance of P. crassifolia. Under natural conditions, Pro contents were very low in both taxa, but increased to levels high enough to contribute significantly to osmotic balance when plants were artificially treated with 450-600mM NaCl - higher salt concentrations than those they would normally encounter in their natural habitats. These data suggest that halophytes possess built-in mechanisms, such as accumulation of additional osmolytes, to rapidly adapt to increasing salinity levels in their natural ecosystems; for example, those expected to be caused by climate change in salt marshes in the Mediterranean region.
Author Address [Pardo-Domenech, L. L.; Tifrea, A.; Grigore, M. N.; Vicente, O.] Univ Politecn Valencia, CSIC, IBMCP, Camino Vera S-N, E-46022 Valencia, Spain. [Tifrea, A.] Univ Agr Sci & Vet Med, Fac Hort, 3-5 Manastur Str, Cluj Napoca 400372, Romania. [Grigore, M. N.] Alexandru Ioan Cuza Univ, Fac Biol, Carol 1,20 A, Iasi 700505, Romania. [Boscaiu, M.] Univ Politecn Valencia, IAM, Camino Vera S-N, E-46022 Valencia, Spain. Vicente, O (reprint author), Univ Politecn Valencia, CSIC, IBMCP, Camino Vera S-N, E-46022 Valencia, Spain. ovicente@ibmcp.upv.es
ISSN 1126-3504
ISBN 1126-3504
Year Published 2016
Volume 150
Issue 5
Beginning Page 904-915
Digital Object Identifier (DOI) 10.1080/11263504.2014.990943
Unique Article Identifier WOS:000384723700006
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