Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/201892
Type: Artigo de periódico
Title: Water Stress Reveals Differential Antioxidant Responses Of Tolerant And Non-tolerant Sugarcane Genotypes.
Author: Boaretto, Luis F
Carvalho, Giselle
Borgo, Lucélia
Creste, Silvana
Landell, Marcos G A
Mazzafera, Paulo
Azevedo, Ricardo A
Abstract: The biochemical responses of the enzymatic antioxidant system of a drought-tolerant cultivar (IACSP 94-2094) and a commercial cultivar in Brazil (IACSP 95-5000) grown under two levels of soil water restriction (70% and 30% Soil Available Water Content) were investigated. IACSP 94-2094 exhibited one additional active superoxide dismutase (Cu/Zn-SOD VI) isoenzyme in comparison to IACSP 95-5000, possibly contributing to the heightened response of IACSP 94-2094 to the induced stress. The total glutathione reductase (GR) activity increased substantially in IACSP 94-2094 under conditions of severe water stress; however, the appearance of a new GR isoenzyme and the disappearance of another isoenzyme were found not to be related to the stress response because the cultivars from both treatment groups (control and water restrictions) exhibited identical changes. Catalase (CAT) activity seems to have a more direct role in H2O2 detoxification under water stress condition and the shift in isoenzymes in the tolerant cultivar might have contributed to this response, which may be dependent upon the location where the excessive H2O2 is being produced under stress. The improved performance of IACSP 94-2094 under drought stress was associated with a more efficient antioxidant system response, particularly under conditions of mild stress.
Subject: Antioxidants
Catalase
Genotype
Glutathione Reductase
Hydrogen Peroxide
Lipid Peroxidation
Saccharum
Stress, Physiological
Water
(1)o(2)
Abiotic Stress
Antioxidant Enzymes
Asa
Cat
Drought Stress
Gpox
Gpx
Gr
Gsh
Gssg
H(2)o(2)
Mda
O(2−)
Oh(•)
Page
Ros
Rwc
Reactive Oxygen Species
Relative Water Content
Sawc
Sod
Soil Available Water Content
Tbars
Ascorbic Acid
Catalase
Glutathione
Glutathione Peroxidase
Glutathione Reductase
Guaiacol Peroxidase
Hydrogen Peroxide
Hydroxyl Radical
Malondialdehyde
Oxidized Glutathione
Polyacrylamide Gel Electrophoresis
Reactive Oxygen Species
Singlet Oxygen
Superoxide Dismutase
Superoxide Radical
Thiobarbituric Acid Reactive Substances
Rights: fechado
Identifier DOI: 10.1016/j.plaphy.2013.11.016
Address: http://www.ncbi.nlm.nih.gov/pubmed/24308986
Date Issue: 2014
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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