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Publication Type J
Authors Behr, J. H., A. Bouchereau, S. Berardocco, C. E. Seal, T. J. Flowers and C. Zorb
Title Metabolic and physiological adjustment of to combined salinity and hypoxia
Source Annals of Botany
Author Keywords Suaeda maritima halophyte metabolomics salinity hypoxia osmotic adjustment halophyte suaeda-maritima gamma-aminobutyric-acid pisum-sativum-l 2 maize hybrids salt tolerance l dum alanine aminotransferase proline accumulation arabidopsis-thaliana oxygen concentration
Abstract Background and Aims Suaeda maritima is a halophyte commonly found on coastal wetlands in the intertidal zone. Due to its habitat S. maritima has evolved tolerance to high salt concentrations and hypoxic conditions in the soil caused by periodic flooding. In the present work, the adaptive mechanisms of S. maritima to salinity combined with hypoxia were investigated on a physiological and metabolic level. Methods To compare the adaptive mechanisms to deficient, optimal and stressful salt concentrations S. maritima plants were grown in a hydroponic culture under low, medium and high salt concentrations. Additionally, hypoxic conditions were applied to investigate the impact of hypoxia combined with different salt concentrations. A non-targeted metabolic approach was used to clarify the biochemical pathways underlying the metabolic and physiological adaptation mechanisms of S. maritima. Key Results Roots exposed to hypoxic conditions showed an increased level of tricarboxylic acid (TCA)-cycle intermediates such as succinate, malate and citrate. During hypoxia, the concentration of free amino acids increased in shoots and roots. Osmoprotectants such as proline and glycine betaine increased in concentrations as the external salinity was increased under hypoxic conditions. Conclusions The combination of high salinity and hypoxia caused an ionic imbalance and an increase of metabolites associated with osmotic stress and photorespiration, indicating a severe physiological and metabolic response under these conditions. Disturbed proline degradation in the roots induced an enhanced proline accumulation under hypoxia. The enhanced alanine fermentation combined with a partial flux of the TCA cycle might contribute to the tolerance of S. maritima to hypoxic conditions.
Author Address [Behr, Jan H.; Zoerb, Christian] Univ Hohenheim, Inst Crop Sci, Qual Plant Prod, Emil Wolff Str 25, D-70599 Stuttgart, Germany. [Bouchereau, Alain; Berardocco, Solenne] Univ Rennes 1, Agrocampus Ouest, INRA UMR1349, F-35653 Le Rheu, France. [Seal, Charlotte E.] Royal Bot Gardens, Comparat Plant & Fungal Biol, Wakehurst Pl, Ardingly RH17 6TN, W Sussex, England. [Flowers, Timothy J.] Univ Sussex, Sch Life Sci, Brighton BN7 1BD, E Sussex, England. [Flowers, Timothy J.] Univ Western Australia, Sch Plant Biol, M084,35 Stirling Highway, Crawley, WA 6009, Australia. Zorb, C (reprint author), Univ Hohenheim, Inst Crop Sci, Qual Plant Prod, Emil Wolff Str 25, D-70599 Stuttgart, Germany. christian.zoerb@unihohenheim.de
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Apr
Year Published 2017
Volume 119
Issue 6
Beginning Page 965-976
Digital Object Identifier (DOI) 10.1093/aob/mcw282
Unique Article Identifier WOS:000400983600007

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