Exogenous p-hydroxybenzoic acid regulates antioxidant enzyme activity and mitigates heat stress of cucumber leaves

2012 ◽  
Vol 148 ◽  
pp. 235-245 ◽  
Author(s):  
Jing Zhang ◽  
Dong-Mei Li ◽  
Wei-Juan Sun ◽  
Xiu-Juan Wang ◽  
Ji-Gang Bai
Keyword(s):  
Enzyme Activity ◽  
Heat Stress ◽  
Antioxidant Enzyme ◽  
Antioxidant Enzyme Activity ◽  
Hydroxybenzoic Acid

Heat stress and antioxidant enzyme activity in bubaline (Bubalus bubalis) oocytes during in vitro maturation

2016 ◽  
Vol 60 (9) ◽  
pp. 1357-1366 ◽  
Author(s):  
Syma Ashraf Waiz ◽  
Mohammad Raies-ul-Haq ◽  
Suman Dhanda ◽  
Anil Kumar ◽  
T. Sridhar Goud ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Heat Stress ◽  
Antioxidant Enzyme ◽  
In Vitro Maturation ◽  
Bubalus Bubalis ◽  
Antioxidant Enzyme Activity

Thiol supplementation in aged animals alters antioxidant enzyme activity after heat stress

2005 ◽  
Vol 99 (6) ◽  
pp. 2271-2277 ◽  
Author(s):  
Joanna P. Morrison ◽  
Mitchell C. Coleman ◽  
Elizabeth S. Aunan ◽  
Susan A. Walsh ◽  
Douglas R. Spitz ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Heat Stress ◽  
Antioxidant Enzyme ◽  
Antioxidant Enzyme Activity

scholarly journals Antioxidant enzyme activity in germination of Dalbergia spruceana seeds under different temperatures

2021 ◽  
Vol 43 ◽  
Author(s):  
Clenes Cunha Lima ◽  
Ely Simone Cajueiro Gurgel ◽  
Eduardo Euclydes de Lima e Borges
Keyword(s):  
Enzyme Activity ◽  
Heat Stress ◽  
Antioxidant Enzyme ◽  
Germination Percentage ◽  
Antioxidant Enzyme Activity ◽  
Percentage Germination ◽  
Germination Process ◽  
Germination Speed ◽  
Different Temperatures ◽  
Effects Of Temperature

Abstract: Antioxidant enzyme activity can be used to measure heat stress and predict the tolerance of a species to heat stress. This study investigated the effects of temperature on germination and antioxidant enzyme activity in Dalbergia spruceana Benth. seeds. Seeds were incubated at constant temperatures of 20, 25, 30, 35, and 40 °C for ten days; and germination percentage, germination speed index, antioxidant enzyme activity, and electrical conductivity were evaluated. Temperature affected the seed germination process but not antioxidant enzyme activity. Germination percentage and germination speed index were higher at 25 and 35 °C and lower at 20 and 40 °C. Superoxide dismutase activity was not affected by temperature. Catalase and peroxidase activities were too low to be used as indicators of temperature stress. The pattern of increasing electrolyte leakage manifested a trend toward loss of cell membrane semipermeability at higher temperatures.

scholarly journals Improvement in Heat Tolerance of Creeping Bentgrass with Melatonin, Rutin, and Silicon

2019 ◽  
Vol 144 (2) ◽  
pp. 141-148 ◽  
Author(s):  
Emily B. Merewitz ◽  
Sha Liu
Keyword(s):  
Lipid Peroxidation ◽  
Enzyme Activity ◽  
Heat Stress ◽  
Fatty Acid ◽  
Linoleic Acid ◽  
Antioxidant Enzyme ◽  
Heat Tolerance ◽  
Acid Content ◽  
Creeping Bentgrass ◽  
Antioxidant Enzyme Activity

Naturally derived products that may enhance the functionality of fertilizers or other agricultural inputs are needed to reduce inputs associated with stress damage and increase the sustainability of turfgrass management. Damage to high-value creeping bentgrass (Agrostis stolonifera) turf areas caused by heat stress is a widespread problem. This study aimed to evaluate multiple, diverse treatments that may illicit antioxidant responses in plants, melatonin, rutin, and Si, when applied as foliar pretreatments to heat stress. Creeping bentgrass plants were grown in growth chambers at optimal (23 °C) or heat stress conditions (35 °C). Turfgrass quality, chlorophyll content, leaf electrolyte leakage, photochemical efficiency, lipid peroxidation, antioxidant enzyme activity, and fatty acid content were measured to determine the effects of foliar treatments on heat stress responses. Melatonin, Si, and rutin were all found to improve some or all of the physiological parameters measured in the study, but only melatonin and Si reduced lipid peroxidation, increased antioxidant enzyme activity, and altered fatty acid contents. Melatonin- and Si-treated plants had greater superoxide dismutase and peroxidase activity and increased the content of the unsaturated fatty acid, linoleic acid, in creeping bentgrass leaves during heat stress compared with controls. Rutin improved turf quality and reduced electrolyte leakage during heat stress, but the mechanism associated with these changes is unclear because no changes were found in antioxidant enzyme activities or fatty acids. Melatonin and Si treatment promoted antioxidant enzyme activity and linoleic acid content of leaves, which have been associated with the improved heat tolerance of creeping bentgrass plants.

Antioxidant Enzyme Levels Inversely Covary with Hearing Loss After Amikacin Treatment

2003 ◽  
Vol 14 (03) ◽  
pp. 134-143 ◽  
Author(s):  
James J. Klemens ◽  
Robert P. Meech ◽  
Larry F. Hughes ◽  
Satu Somani ◽  
Kathleen C.M. Campbell
Keyword(s):  
Hearing Loss ◽  
Enzyme Activity ◽  
Antioxidant Enzyme ◽  
Guinea Pigs ◽  
Auditory Brainstem ◽  
Antioxidant Enzyme Activity ◽  
Control Group ◽  
Glutathione S Transferase ◽  
Brainstem Response ◽  
The Difference

This study's purpose was to determine if a correlation exists between cochlear antioxidant activity changes and auditory function after induction of aminoglycoside (AG) ototoxicity. Two groups of five 250-350 g albino guinea pigs served as subjects. For 28 days, albino guinea pigs were administered either 200 mg/kg/day amikacin, or saline subcutaneously. Auditory brainstem response testing was performed prior to the first injection and again before sacrifice, 28 days later. Cochleae were harvested and superoxide dismutase, catalase, glutathione peroxidase, glutathione-S-transferase, glutathione reductase activities and malondialdehyde levels were measured. All antioxidant enzymes had significantly lower activity in the amikacin group (p ≤ 0.05) than in the control group. The difference in cochlear antioxidant enzyme activity between groups inversely correlated significantly with the change in ABR thresholds. The greatest correlation was for the high frequencies, which are most affected by aminoglycosides. This study demonstrates that antioxidant enzyme activity and amikacin-induced hearing loss significantly covary.

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