Loading content, please wait..
loading..
Logo
Version 3.15
or
Publication Type J
Authors Al Hassan, M., J. Chaura, M. P. Donat-Torres, M. Boscaiu and O. Vicente
Title Antioxidant responses under salinity and drought in three closely related wild monocots with different ecological optima
Source Aob Plants
Author Keywords Antioxidant enzymes antioxidant phenolics ecological adaptation Juncus malondialdehyde (MDA) photosynthetic pigments salt stress water deficiency stress reactive oxygen oxidative stress arabidopsis-thaliana salt stress lipid-peroxidation hydrogen-peroxide lycopersicon-pennellii superoxide-dismutase gene-expression abiotic stress
Abstract Some deleterious effects of drought, soil salinity and other abiotic stresses are mediated by the generation of oxidative stress through an increase in reactive oxygen species (ROS) that damage cellular membranes, proteins and DNA. In response to increased ROS, plants activate an array of enzymatic and non-enzymatic antioxidant defences. We have correlated the activation of these responses with the contrasting tolerance to salinity and drought of three species of the genus Juncus, viz. J. maritimus, J. acutus (both halophytes) and J. articulatus (salt-sensitive). Both stresses were given for 8 weeks to 6-week-old seedlings in a controlled environment chamber. Each stress inhibited growth and degraded photosynthetic pigments in the three species with the most pronounced effects being in J. articulatus. Salt and water stress also generated oxidative stress in all three taxa with J. articulatus being the most affected in terms of accumulation of malondialdehyde (a reliable oxidative stress marker). The apparent lower oxidative stress in halophytic J. maritimus and J. acutus compared with salt-sensitive J. articulatus is explained by a more efficient activation of antioxidant systems since salt or water deficiency induced a stronger accumulation of antioxidant phenolic compounds and flavonoids in J. maritimus and J. acutus than in J. articulatus. Qualitative and quantitative differences in antioxidant enzymes were also detected when comparing the three species and the two stress treatments. Accordingly, glutathione reductase and superoxide dismutase activities increased in the two halophytes under both stresses, but only in response to drought in J. articulatus. In contrast, ascorbate peroxidase activity varied between and within species according to treatment. These results show the relative importance of different antioxidant responses for stress tolerance in species with distinct ecological requirements. The salt-sensitive J. articulatus, contrary to the tolerant taxa, did not activate enzymatic antioxidant responses to salinity-induced oxidative stress.
Author Address [Al Hassan, Mohamad; Chaura, Juliana; Vicente, Oscar] Univ Politecn Valencia, CSIC, Inst Biol Mol & Celular Plantas UPV, E-46022 Valencia, Spain. [Donat-Torres, Maria P.] Univ Politecn Valencia, Inst Invest Gest Integral Zonas Costera UPV, Gandia 46730, Spain. [Boscaiu, Monica] Univ Politecn Valencia, Inst Agroforestal Mediterraneo UPV, E-46022 Valencia, Spain. [Al Hassan, Mohamad] New Zealand Inst Plant & Food Res Ltd, Auckland, New Zealand. [Chaura, Juliana] Univ ICESI, Fac Nat Sci, Dept Biol Sci, Cali, Colombia. Vicente, O (reprint author), Univ Politecn Valencia, CSIC, Inst Biol Mol & Celular Plantas UPV, E-46022 Valencia, Spain. ovicente@ibmcp.upv.es
ISSN 2041-2851
ISBN 2041-2851
29-Character Source Abbreviation Aob Plants
Year Published 2017
Volume 9
Digital Object Identifier (DOI) 10.1093/aobpla/plx009
Unique Article Identifier WOS:000407377500002

LEGAL NOTICES — This website is protected by Copyright © The University of Sussex, 2012, 2013, 2014, 2015, 2016, 2017. The eHALOPH database is protected by Database Right and Copyright © The University of Sussex and other contributors, 2006, 2012, 2013, 2014, 2015, 2016, 2017. This database is based on an earlier work by James Aronson.
THIS WEBSITE AND THIS DATABASE ARE PROVIDED ON AN "AS IS" BASIS, AND YOU USE THEM AND RELY ON THEM AT YOUR OWN RISK.

Contact email: halophytes@sussex.ac.uk
Credits – Tim Flowers, Joaquim Santos, Moritz Jahns, Brian Warburton, Peter Reed