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Publication Type J
Authors Hasanuzzaman, M., M. Inafuku, K. Nahar, M. Fujita and H. Oku
Title Nitric Oxide Regulates Plant Growth, Physiology, Antioxidant Defense, and Ion Homeostasis to Confer Salt Tolerance in the Mangrove Species, Kandelia obovata
Source Antioxidants
Author Keywords halophytes antioxidants reactive oxygen species soil salinity signaling molecules abiotic stress
Abstract Facultative halophyte Kandelia obovata plants were exposed to mild (1.5% NaCl) and severe (3% NaCl) salt stress with or without sodium nitroprusside (SNP; 100 mu M; a NO donor), hemoglobin (Hb, 100 mu M; a NO scavenger), or N omega-nitro-L-arginine methyl ester (L-NAME, 100 mu M; a NO synthase inhibitor). The plants were significantly affected by severe salt stress. They showed decreases in seedling growth, stomatal conductance, intercellular CO2 concentration, SPAD value, photosynthetic rate, transpiration rate, water use efficiency, and disrupted antioxidant defense systems, overproduction of reactive oxygen species, and visible oxidative damage. Salt stress also induced ion toxicity and disrupted nutrient homeostasis, as indicated by elevated leaf and root Na+ contents, decreased K+ contents, lower K+/Na+ ratios, and decreased Ca contents while increasing osmolyte (proline) levels. Treatment of salt-stressed plants with SNP increased endogenous NO levels, reduced ion toxicity, and improved nutrient homeostasis while further increasing Pro levels to maintain osmotic balance. SNP treatment also improved gas exchange parameters and enhanced antioxidant enzymes' activities (catalase, ascorbate peroxidase, monodehydroascorbate reductase, and dehydroascorbate reductase). Treatment with Hb and l-NAME reversed these beneficial SNP effects and exacerbated salt damage, confirming that SNP promoted stress recovery and improved plant growth under salt stress.
Author Address [Hasanuzzaman, Mirza; Inafuku, Masashi; Oku, Hirosuke] Univ Ryukyus, Trop Biosphere Res Ctr, Ctr Mol Biosci COMB, Mol Biotechnol Grp, 1 Senbaru, Nishihara, Okinawa 9030213, Japan. [Hasanuzzaman, Mirza] Sher E Bangla Agr Univ, Fac Agr, Dept Agron, Dhaka 1207, Bangladesh. [Nahar, Kamrun] Sher e Bangla Agr Univ, Fac Agr, Dept Agr Bot, Dhaka 1207, Bangladesh. [Fujita, Masayuki] Kagawa Univ, Fac Agr, Dept Appl Biol Sci, Lab Plant Stress Responses, 2393 Ikenobe, Miki, Kagawa 7610795, Japan. Hasanuzzaman, M; Oku, H (corresponding author), Univ Ryukyus, Trop Biosphere Res Ctr, Ctr Mol Biosci COMB, Mol Biotechnol Grp, 1 Senbaru, Nishihara, Okinawa 9030213, Japan.; Hasanuzzaman, M (corresponding author), Sher E Bangla Agr Univ, Fac Agr, Dept Agron, Dhaka 1207, Bangladesh. mhzsauag@yahoo.com; h098648@eve.u-ryukyu.ac.jp; knahar84@yahoo.com; fujita@ag.kagawa-u.ac.jp; okuhiros@comb.u-ryukyu.ac.jp
29-Character Source Abbreviation Antioxidants
Publication Date Apr
Year Published 2021
Volume 10
Issue 4
Digital Object Identifier (DOI) 10.3390/antiox10040611
Unique Article Identifier WOS:000642721800001

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