Loading content, please wait..
loading..
Logo
Version 3.20
or
Publication Type J
Authors Lokhande, V. H., A. K. Srivastava, S. Srivastava, T. D. Nikam and P. Suprasanna
Title Regulated alterations in redox and energetic status are the key mediators of salinity tolerance in the halophyte Sesuvium portulacastrum (L.) L
Source Plant Growth Regulation
Author Keywords Antioxidant enzymes Ascorbate Energetics Glutathione Redox state Sesuvium portulacastrum salt tolerance superoxide-dismutase oxidative stress water relations growth proline plants antioxidants glutathione ascorbate
Abstract The present work addresses the importance of antioxidant, redox and energetic parameters in regulating salt-tolerance in Sesuvium portulacastrum. Experiments were conducted on 45 days old plants subjected to 250 and 1,000 mM NaCl stress for 2-8 days. Plants showed no significant change in growth parameters (shoot length, dry weight, and water content) at 250 mM NaCl as compared to control. However, growth of plants was significantly affected at 1,000 mM NaCl. The differential growth behaviour could be attributed to a greater decline in the energetic parameters (in terms of ratios of NADP/NADPH and ATP/ADP) at 1,000 mM NaCl than at 250 mM NaCl. The osmotic stress imposed to plants at 250 mM NaCl was presumably balanced by the accumulation of sodium ions (Na(+)), an energetically favorable process, and did not require an increased synthesis of proline. In contrast, to counter osmotic stress at 1,000 mM NaCl, plants accumulated Na(+) as well as proline and were, therefore, energetically stressed. Further, the response of enzymatic and molecular antioxidants at 1,000 mM was either close to or even lower than that at 250 mM, which resulted in oxidative damage at 1,000 mM, particularly on longer durations. In conclusion, it is suggested that altered redox and energetic status of the plants could play a key role in mediating the tolerance of Sesuvium under salinity stress.
Author Address [Lokhande, Vinayak H.; Srivastava, Ashish K.; Srivastava, Sudhakar; Suprasanna, Penna] Bhabha Atom Res Ctr, Funct Plant Biol Sect, Nucl Agr & Biotechnol Div, Bombay 400085, Maharashtra, India. [Lokhande, Vinayak H.; Nikam, Tukaram D.] Univ Pune, Dept Bot, Pune 411007, Maharashtra, India. Suprasanna, P (reprint author), Bhabha Atom Res Ctr, Funct Plant Biol Sect, Nucl Agr & Biotechnol Div, Bombay 400085, Maharashtra, India penna888@yahoo.com
ISSN 0167-6903
ISBN 0167-6903
29-Character Source Abbreviation Plant Growth Regul.
Publication Date Nov
Year Published 2011
Volume 65
Issue 2
Beginning Page 287-298
Digital Object Identifier (DOI) 10.1007/s10725-011-9600-3
Unique Article Identifier WOS:000297620300010
Plants associated with this reference

LEGAL NOTICES — This website is protected by Copyright © The University of Sussex, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020. The eHALOPH database is protected by Database Right and Copyright © The University of Sussex and other contributors, 2006, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020. 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