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Publication Type J
Authors Tabot, P. T. and J. B. Adams
Title Responses of the Salt Marsh Succulent Bassia diffusa (Thunb.) Kuntze to Salinity and Inundation
Source Wetlands
Author Keywords Bassia diffusa Succulence Oxalic acid Anthocyanin Drought Climate change south-africa physiological-responses phragmites-australis kochia-sieversiana spartina-maritima stress tolerance drought stress climate-change plant halophyte
Abstract Bassia diffusa is a dominant species in the upper intertidal ranges of many salt marshes in South Africa, yet little information exists on its ecophysiology. This is important, as increased flooding or drought has been predicted for different salt marshes. The responses of this species to simulated climate conditions were studied. Plants were grown for 3 months under tidal-, submerged- and drought conditions each with five salinity levels from 0 to 46.4 g l(-1). Under submergence, plants died within 1 month, irrespective of the salinity. Optimum growth occurred in tidal-treated plants at 18.5 g l(-1), and decreased with increased salinity and drought conditions. Succulence of drought-treated plants decreased relative to that of tidal-treated ones; plants possibly used up water reserves under increasing drought stress. Reduced leaf mass was indicative of drought hardiness in the species. These adaptations would permit the species to survive season-long drought and salinity conditions. Anthocyanin concentration in leaves and stems was not sufficiently high to be osmotically important, suggesting alternative functions for anthocyanin accumulated in response to drought, and alternative mechanisms for osmoregulation. These remain the subject of further research. Results are significant for better salt marsh management under predicted conditions.
Author Address [Tabot, P. T.; Adams, J. B.] Nelson Mandela Metropolitan Univ, Dept Bot, ZA-6031 Port Elizabeth, South Africa. Tabot, PT (reprint author), Nelson Mandela Metropolitan Univ, Dept Bot, Summerstrand South Campus,POB 77000, ZA-6031 Port Elizabeth, South Africa. s210121807@live.nmmu.ac.za; Janine.Adams@nmmu.ac.za
ISSN 0277-5212
ISBN 0277-5212
29-Character Source Abbreviation Wetlands
Publication Date Oct
Year Published 2013
Volume 33
Issue 5
Beginning Page 787-797
Digital Object Identifier (DOI) 10.1007/s13157-013-0436-7
Unique Article Identifier WOS:000324107200002
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