National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field experiment was conducted to study the response of antioxidant enzymes to oxidative damage caused by heat stress induced by changing dates of transplanting in two rice (Oryza sativa L.) genotypes viz., ‘N22’ (heat tolerant) and ‘IR8’ (heat susceptible). During grain filling period, constitutive level of antioxidative enzymes viz., superoxide dismutase, catalase, ascorbate peroxidase, was found to be 35.7, 88.8 and 84.1% higher respectively, while the content of non-enzymatic antioxidants viz., ascorbate and proline was 78.5 and 81.8% higher respectively, in ‘N22’ than in ‘IR8’ under heat stress encountered during early transplanting. In contrast, the hydrogen peroxide and malondialdehyde content were 42.1 and 28.4% higher in ‘IR8’ during early transplanting. Heat stress resulted in significant reduction of chlorophyll content during early transplanting in both the genotypes though the reduction was less in ‘N22’ (27.6%) as compared to ‘IR8’ (45.2%). The increased and timely response of antioxidant enzymes along with the non enzymatic antioxidants is suggestive of their significant role in development of tolerance exhibited by the cultivar ‘N22’ under heat stress conditions.
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