Journal ArticleDOI
Salinity induced oxidative stress and antioxidant system in salt-tolerant and salt-sensitive cultivars of rice Oryza sativa L
TLDR
It is inferred that leaves of salt-tolerant cultivars tend to attain greater capacity to perform reactions of antioxidative pathway under saline conditions to combat salinity-induced oxidative stress.Abstract:
Indices of oxidative stress viz., superoxide radical and H2O2 content increased in leaves of all the cultivars with the rise in salinity level, the increase was more pronounced and significant in salt-sensitive varieties and non-significant in resistant cultivars. Except for glutathione reductase (GR), basal activities of all other antioxidative enzymes viz. superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), ascorbate peroxidase (APX) and glutathione reductase (GR) were significantly higher in leaves of all the resistant cultivars as compared to the sensitive ones. A differential response of salinity was observed on various enzymatic and non-enzymatic components of antioxidant system in leaves of salt-tolerant and salt-sensitive cultivars of rice (Oryza sativa L.). Activities of superoxide dismutase and glutathione reductase enhanced in all the tolerant cultivar while declined in the sensitive cultivars with increasing salinity from 0 to 100 mM. Salt-stress induced the activities of catalase and peroxidase in all the cultivars but the magnitude of increase was more pronounced in the sensitive cultivars than in the tolerant cultivars. Contrarily, APX activity increased in the salt-sensitive cultivars but showed no significant change in the salt-tolerant cultivars. The amount of ascorbic acid content, reduced glutathione (GSH), reduced/oxidized glutathione (GSSG) ratio was higher in leaves of the tolerant cultivars than that of the sensitive cultivars under saline conditions. It is inferred that leaves of salt-tolerant cultivars tend to attain greater capacity to perform reactions of antioxidative pathway under saline conditions to combat salinity-induced oxidative stress.read more
Citations
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Journal ArticleDOI
High Salinity Induces Different Oxidative Stress and Antioxidant Responses in Maize Seedlings Organs
TL;DR: It is suggested that Na+ is retained and detoxified mainly in roots, and less stress impact is observed in mature and younger leaves, allowing leaves to activate their defense mechanisms for better protection against salt stress.
Journal ArticleDOI
Effect of salt stress on ion concentration, proline content, antioxidant enzyme activities and gene expression in tomato cultivars.
TL;DR: Toler genotypes also displayed differential patterns of gene expression, and a high K+, Ca2+ and proline accumulation as well as a decrease in Na+ concentration mediated salt tolerance.
Journal ArticleDOI
Regulation of ROS Metabolism in Plants under Environmental Stress: A Review of Recent Experimental Evidence.
Mirza Hasanuzzaman,M. H. M. Borhannuddin Bhuyan,Khursheda Parvin,Khursheda Parvin,Tasnim Farha Bhuiyan,Taufika Islam Anee,Kamrun Nahar,Shahadat Hossen,Faisal Zulfiqar,M. D. Mahabub Alam,Masayuki Fujita +10 more
TL;DR: The physicochemical basis of ROS production, cellular compartment-specific ROS generation pathways, and their possible distressing effects are discussed and the function of the antioxidant defense system for detoxification and homeostasis of ROS for maximizing defense is discussed.
Journal ArticleDOI
Improvement of salinity stress tolerance in rice: Challenges and opportunities
Thi My Linh Hoang,Thach Ngoc Tran,Thuy Kieu Tien Nguyen,Brett Williams,Penelope Wurm,Sean M. Bellairs,Sagadevan G. Mundree +6 more
TL;DR: Challenges that hinder the improvement of salinity stress tolerance in rice are discussed as well as potential opportunities for enhancing salinity Stress tolerance in this important crop are discussed.
References
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Journal ArticleDOI
The occurrence of superoxide anion in the reaction of reduced phenazine methosulfate and molecular oxygen
TL;DR: The reduction of nitro blue tetrazolium (NitroBT) with NADH mediated by phenazine methosulfate (PMS) under aerobic conditions was inhibited upon addition ofsuperoxide dismutase, indicating the involvement of superoxide aninon radical in the reduction of NitroBT.