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Publication Type J
Authors Ben Hsouna, A., T. Ghneim-Herrera, W. Ben Romdhane, A. Dabbous, R. Ben Saad, F. Brini, C. Abdelly and K. Ben Hamed
Title Early effects of salt stress on the physiological and oxidative status of the halophyte Lobularia maritima
Source Functional Plant Biology
Author Keywords antioxidant enzymes gene expression ion homeostasis polyphenols short-term responses sweet alyssum antioxidant enzyme-activities vacuolar h+-atpase arabidopsis-thaliana na+/h+ antiporter salinity stress cakile-maritima water relations tolerance responses sodium
Abstract Soil salinity is an abiotic stress that reduces agricultural productivity. For decades, halophytes have been studied to elucidate the physiological and biochemical processes involved in alleviating cellular ionic imbalance and conferring salt tolerance. Recently, several interesting genes with proven influence on salt tolerance were isolated from the Mediterranean halophyte Lobularia maritima (L.) Desv. A better understanding of salt response in this species is needed to exploit its potential as a source of stress-related genes. We report the characterisation of L. maritima's response to increasing NaCl concentrations (100-400 mM) at the physiological, biochemical and molecular levels. L. maritima growth was unaffected by salinity up to 100 mM NaCl and it was able to survive at 400 mM NaCl without exhibiting visual symptoms of damage. Lobularia maritima showed a Na (+) and K+ accumulation pattern typical of a salt-includer halophyte, with higher contents of Na (+) in the leaves and K (+) in the roots of salt-treated plants. The expression profiles of NHX1, SOS1, HKT1 , KT1 and VHA-E1 in salt-treated plants matched this Na+ and K+ accumulation pattern, suggesting an important role for these transporters in the regulation of ion homeostasis in leaves and roots of L. maritima. A concomitant stimulation in phenolic biosynthesis and antioxidant enzyme activity was observed under moderate salinity, suggesting a potential link between the production of polyphenolic antioxidants and protection against salt stress in L. maritima. Our findings indicate that the halophyte L. maritima can rapidly develop physiological and antioxidant mechanisms to adapt to salt and manage oxidative stress.
Author Address [Ben Hsouna, Anis; Ben Romdhane, Walid; Ben Saad, Rania; Brini, Faical] Univ Sfax, Biotechnol & Plant Improvement Lab, Ctr Biotechnol Sfax, POB 1177, Sfax 3018, Tunisia. [Ben Hsouna, Anis] Fac Sci Gafsa, Dept Life Sci, Gafsa 2112, Tunisia. [Ghneim-Herrera, Thaura] Univ ICESI, Dept Ciencias Biol, Calle 18 122-135, Cali, Colombia. [Ben Romdhane, Walid] King Saud Univ, Coll Food & Agr Sci, Plant Prod Dept, POB 2460, Riyadh 11451, Saudi Arabia. [Dabbous, Amira; Abdelly, Chedly; Ben Hamed, Karim] Ctr Biotechnol Borj Cedria, Lab Extremophile Plants, POB 901, Hammam Lif 2050, Tunisia. Ben Hamed, K (corresponding author), Ctr Biotechnol Borj Cedria, Lab Extremophile Plants, POB 901, Hammam Lif 2050, Tunisia. kbenhamed@yahoo.fr
ISSN 1445-4408
ISBN 1445-4408
29-Character Source Abbreviation Funct. Plant Biol.
Digital Object Identifier (DOI) 10.1071/fp19303
Unique Article Identifier WOS:000546641100001

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