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Publication Type J
Authors Kumar, A., A. Mann, A. Kumar, N. Kumar and B. L. Meena
Title Physiological response of diverse halophytes to high salinity through ionic accumulation and ROS scavenging
Source International Journal of Phytoremediation
Author Keywords Salinity halophytes Na plus K+ Na plus Ca2+ Na plus Cl antioxidative defense system
Abstract Salt stress induced modulations in different ionic ratios and ROS system were studied in ten halophytic species, namely Atriplex lentiformis, Tamarix aphylla, Sporobolus marginatus, Suaeda nudiflora, Urochondra setulosa, Arundo donax, Aeluropus lagopoides, Heliotropium ramossimum, Atriplex nummularia, Leptachloa fusca at salinity level of ECe similar to 30 dSm(-1) (approximate to 300 mM NaCl) to explore their possible role in salt tolerance ability of these halophytes. These halophytes were categorized for their salt tolerance levels based on the ratios of Na+/K+, Na+/Ca2+, Na+/Cl- and Na + Cl/K + Ca. Variable responses were observed among all halophytes where Atriplex lentiformis had lowest leaf Na+/K+ (0.44) which is one of the best indicator of salt tolerance, Heliotropium ramossimum had lowest Na+/Ca2+ and Na+/Cl- (0.97 and 0.18), whereas Sporobolus marginatus had lowest Na + Cl/K + Ca (0.79). Specific enzymes activities of ascorbate peroxidase (APX), superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) were also assessed to get better comprehension of the ROS scavenging system under salinity in these halophytes. Urochondra setulosa showed highest APX and SOD activity followed by Atriplex lentiformis. Most efficient enzyme in degrading hydrogen peroxide i.e. CAT showed highest activity in Suaeda nudiflora followed by Atriplex nummularia and Urochondra setulosa, whereas Atriplex nummularia and Atriplex lentiformis showed higher POX activity. Significant variability in H2O2 and MDA content was also observed. These results possibly suggest higher inbuilt genetic potential of these halophytes to combat high salinity induced oxidative stress via higher antioxidant activities. Novelty statement: Halophytic plant adopt different strategies to cope up with the toxic ions and our studies show that the induction of antioxidant defense system to scavenge ROS, alongwith structural modifications in terms of lipid peroxidation and compartmentalization of toxic ions are the main strategies for tighter control of ion fluxes in the studied halophytes.
Author Address [Kumar, Ashwani; Mann, Anita; Kumar, Arvind; Kumar, Naresh; Meena, Babu Lal] ICAR Cent Soil Salin Res Inst, Karnal, Haryana, India. Kumar, A (corresponding author), ICAR Cent Soil Salin Res Inst, Karnal, Haryana, India. Ashwani.Kumar1@icar.gov.in
ISSN 1522-6514
ISBN 1522-6514
29-Character Source Abbreviation Int. J. Phytoremediat.
Digital Object Identifier (DOI) 10.1080/15226514.2021.1874289
Unique Article Identifier WOS:000614186600001
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