Responses of antioxidative system to chilling stress in two rice cultivars differing in sensitivity
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Abstract
The responses of antioxidative system of rice to chilling were investigated in a tolerant cultivar, Xiangnuo-1, and a susceptible cultivar, IR-50. The electrolyte leakage and malondialdehyde content of Xiangnuo-1 were little affected by chilling treatment but those of IR-50 increased. Activities of suoperoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase, and ascorbic acid content of Xiangnuo-1 were remained high, while those of IR-50 decreased under chilling. The results indicated that higher activities of defense enzymes and higher content of antioxidant under stress were associated with tolerance to chilling.
Additional key words
ascorbate peroxidase ascorbic acid catalase glutathione reductase superoxide dismutaseAbbreviations
- ROS
reactive oxygen species
- AsA
ascorbic acid
- APX
ascorbate peroxidase
- CAT
catalase
- GR
glutathione reductase
- GSH
glutathione, reduced form
- MDA
malondialdehyde
- SOD
superoxidase
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