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Publication Type J
Authors Katschnig, D., R. Broekman and J. Rozema
Title Salt tolerance in the halophyte Salicornia dolichostachya Moss: Growth, morphology and physiology
Source Environmental and Experimental Botany
Author Keywords Salicornia dolichostachya Moss Salinity tolerance Salt stimulated growth Na+:K+-ratio and K+-selectivity Glycine betaine maritima l dum suaeda-maritima leaf-cells salinity tolerance glycine betaine bigelovii torr nacl stress plants europaea photosynthesis
Abstract Salinization of agricultural land is an increasing problem. Because of their high tolerance to salinity, Salicornia spp. could become models to study salt tolerance; they also represent promising saline crops. The salinity-growth response curve for Salicornia dolichostachya Moss was evaluated at 12 salt concentrations in a hydroponic study in a greenhouse and at 5 different seawater dilutions in an outside setting. Salt concentrations ranged between 0 mM and 500 mM NaCl (approximate to seawater salinity). Plants were grown for six weeks and morphological and physiological adaptations in different tissues were evaluated. S. dolichostachya had its growth optimum at 300 mM NaCl in the root medium, independent of the basis on which growth was expressed. The relative growth rate (RGR) in the greenhouse experiment was comparable with RGR-values in the outdoor growth experiment. Leaf succulence and stem diameter had the highest values at the growth optimum (300 mM NaCl). Carbon isotope discrimination (delta C-13) decreased upon salinity. S. dolichostachya maintained a lower leaf sap osmotic potential relative to the external solution over the entire salinity range, this was mainly accomplished by accumulation of Na+ and Cl-. Glycine betaine concentrations did not significantly differ between the treatments. Na+:K+-ratio and K+-selectivity in the shoots increased with increasing salinity, both showed variation between expanding and expanded shoot tissue. We conclude that S. dolichostachya was highly salt tolerant and showed salt requirement for optimal growth. Future growth experiments should be done under standardized conditions and more work at the tissue and cellular level needs to be done to identify the underlying mechanisms of salt tolerance. (C) 2012 Elsevier B.V. All rights reserved.
Author Address [Katschnig, Diana; Broekman, Rob; Rozema, Jelte] Vrije Univ Amsterdam, Fac Earth & Life Sci, Dept Ecol Sci, NL-1081 HV Amsterdam, Netherlands. Katschnig, D (reprint author), Vrije Univ Amsterdam, Fac Earth & Life Sci, Dept Ecol Sci, Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands. d.katschnig@vu.nl
ISSN 0098-8472
ISBN 0098-8472
29-Character Source Abbreviation Environ. Exp. Bot.
Publication Date Aug
Year Published 2013
Volume 92
Beginning Page 32-42
Digital Object Identifier (DOI) 10.1016/j.envexpbot.2012.04.002
Unique Article Identifier WOS:000320678600004
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