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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2019.8(7): 1518-1529
DOI: https://doi.org/10.20546/ijcmas.2019.807.181


Variation in Antioxidant Responses in Rice (Oryza sativa L.) Genotypes Differing in Sensitivity to Heat Stress
K.P. Sharma1*, N. Sharma2 and R. Kaur2
1Department of Biochemistry, Punjab Agricultural University, Ludhiana, Punjab, India 141004
2Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab, India 141004
*Corresponding author
Abstract:

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.


Keywords: Rice, Date of transplanting, Heat stress, Enzymatic antioxidants, Non-enzymatic antioxidants
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How to cite this article:

Sharma, K.P., N. Sharma and Kaur, R. 2019. Variation in Antioxidant Responses in Rice (Oryza sativa L.) Genotypes Differing in Sensitivity to Heat Stress.Int.J.Curr.Microbiol.App.Sci. 8(7): 1518-1529. doi: https://doi.org/10.20546/ijcmas.2019.807.181