Annals of Botany

Responses of a coastal halophyte to combined salinity and hypoxia

Suaeda maritima is a halophyte commonly found on coastal wet lands in the intertidal zone. Due to its habitat, S. maritima has evolved tolerance to high salt concentrations and low oxygen conditions (hypoxia) in the soil caused by periodic flooding.

Phenotype of Suaeda maritima grown under different salt concentrations and normoxic and hypoxic conditions
Phenotype of Suaeda maritima grown under different salt concentrations and normoxic and hypoxic conditions. Plants grown for 6 weeks in a hydroponic culture with low, medium and high salt concentrations (n = 5). Normoxic and hypoxic conditions were imposed for 5 d. Scale bars = 5 cm.

Behr et al. analyse the metabolic and physiological adjustment of S. maritima to combined salinity and hypoxia. The results show that the combination of high salinity and oxygen depletion cause an ionic imbalance and an increase of metabolites associated with osmotic stress. Alanine fermentation and a partial flux of the tricarboxylic acid (TCA) cycle contribute to control the anaerobic energy metabolism during hypoxic conditions in the root.

Reference

Behr, J. H., Bouchereau, A., Berardocco, S., Seal, C. E., Flowers, T. J., & Zörb, C. (2017). Metabolic and physiological adjustment of Suaeda maritima to combined salinity and hypoxia. Annals of Botany, mcw282. https://doi.org/10.1093/aob/mcw282

About the author

Annals of Botany Office

The Annals of Botany Office is based at the University of Oxford.

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