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Publication Type J
Authors Marchesini, V. A., C. H. Yin, T. D. Colmer and E. J. Veneklaas
Title Drought tolerances of three stem-succulent halophyte species of an inland semiarid salt lake system
Source Functional Plant Biology
Author Keywords osmotic adjustment pigments Salicornioideae salt marsh stress succulence salinity tolerance ion concentrations water-stress plants australia chenopodiaceae mechanisms halosarcia betalains
Abstract Succulent halophytes of the genus Tecticornia are dominant in salt marshes of inland lakes of Australia. We assessed the drought responses of a C-4 species, Tecticornia indica subsp. bidens (Nees) K.A. Sheph. & Paul G. Wilson, and two C-3 species, Tecticornia auriculata Paul G. Wilson (K.A. Sheph. & Paul G. Wilson) and Tecticornia medusa (K.A. Sheph. & S.J. van Leeuwen) that occur in the Fortescue Marsh, north-west Australia. In a glasshouse experiment, the three species were grown individually and in different combinations, with varying number of plants per pot to achieve comparable dry-down rates among pots. Prior to the imposition of drought (by withholding water) the three species showed differences in dry mass and physiological variables. As the soil dried out, the three species showed similar reductions of transpiration, osmotic potential and photochemical efficiency. Shoot growth was depressed more than root growth. Tissue water loss from portions of the succulent shoots accounted for similar to 30% of transpiration during severe drought stress. There was no osmotic adjustment. Shoot tissue concentrations of Na+ and Cl-tended to increase during drought, and those of K+ decreased; however, these changes were not always statistically significant. Chlorophyll concentration decreased but betacyanin concentration increased. Despite occupying distinct positions in a water and salinity gradient, the three Tecticornia species had remarkably similar responses to soil water deficit.
ISSN 1445-4408
ISBN 1445-4408
29-Character Source Abbreviation Funct. Plant Biol.
Year Published 2014
Volume 41
Issue 12
Beginning Page 1230-1238
Digital Object Identifier (DOI) 10.1071/fp14108
Unique Article Identifier WOS:000345761100003
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