Role of gamma-oryzanol in drought-tolerant and susceptible cultivars of rice (Oryza sativa L.)

Drought-tolerant cultivars and their phytochemical composition, which has a role in providing drought tolerance are gaining importance. In this study, rice bran oil and semi-purified oryzanol (SPO) obtained from five rice (Oryza sativa L.) cultivars, namely P1401 and PB1 (drought-susceptible) and N2...

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Published inIndian journal of biochemistry & biophysics Vol. 51; no. 1; pp. 75 - 80
Main Authors Kumar, M S Sujith, Dahuja, Anil, Rai, R D, Walia, Suresh, Tyagi, Aruna
Format Journal Article
LanguageEnglish
Published India 01.02.2014
Subjects
Antioxidants - metabolism
Droughts
Oryza - cytology
Oryza - metabolism
Oryza - physiology
Phenylpropionates - isolation & purification
Phenylpropionates - metabolism
Plant Oils - metabolism
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Summary:Drought-tolerant cultivars and their phytochemical composition, which has a role in providing drought tolerance are gaining importance. In this study, rice bran oil and semi-purified oryzanol (SPO) obtained from five rice (Oryza sativa L.) cultivars, namely P1401 and PB1 (drought-susceptible) and N22, PNR381 and APO (drought-tolerant) were analyzed for the gamma-oryzanol content, an antioxidant present in considerable amount in the rice bran. The higher level of gamma-oryzanol and its antioxidant activity was observed in drought-tolerant cultivars (N22, PNR381 and APO) as compared to drought-susceptible (PB1 and P1401), suggesting the role of gamma-oryzanol in drought tolerance, as antioxidants are known to play an important role by scavenging free radicals. The total antioxidant activity of gamma-oryzanol might be attributed to 24-methylene cycloartanyl ferulate, a major component of gamma-oryzanol. By enhancing the level of active oryzanol components identified in this study by genetic and molecular means could impart increased drought tolerance.
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ISSN:0301-1208