Oxidative stress and antioxidative system in Brassica juncea (L.) under high temperature stress
2012
Rani, B. | Jain, V. | Chhabra, M.L. | Dhawan, K. | Kumari, N. | Yadav, P.
Indices of oxidative stress viz., HPz, MDA content and lip oxygenase activity (LOX) increased in seedlings of both thermotolerant and thermosusceptible ge~ptypes when subjectd to high temperature stress and increase was more pronounced in thermosusceptible genotype NPJ-119 as compared to tolerant genotype NRCDR-02. Activity of antioxidative enzymes i. e. Superoxide dislTIutase (SOD), catalase (CAT), peroxidase (POX), ascorbate peroxidase (APX) and glutathione reductase (GR) increased in both the genotypes under stress but increase was found significantly higher in t~lerant genotype. The basal level of POX and APX was found more in tolerant genotype and activity of SOD and GR under control was found almost same in both the genotypes but catalase activity was found more in susceptible genotype. Non-enzymatic metabolite ascorbib acid and carotenoid content were also found increased under stress in both the genotypes. However, on revival, BOX activity, MDA and HzOz content decreased as compared to stress conditions in both the genotypes.Antioxidative enzymes on revived viz., SOD and CAT started decreasing but the activity of POX and GR still continued to increase in both the genotypes, however, APX enzyme exhibited differential behaviour which increased in tolerant genotyp but decreased in susceptible genotype. However, carotenoid decreased and ASA still continued to increase in both the genotypes on revival.
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