Role of γ-oryzanol in drought-tolerant and susceptible cultivars of rice (Oryza sativa L.).
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Date
2014-02
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Abstract
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 γ-oryzanol content, an antioxidant present in considerable amount in the rice bran. The higher level of γ-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 γ-oryzanol in drought tolerance, as antioxidants are known to play an important role by scavenging free radicals. The total antioxidant activity of γ-oryzanol might be attributed to 24-methylene cycloartanyl ferulate, a major component of γ-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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Keywords
Oryza sativa, γ-Oryzanol, RP-HPLC, Drought tolerance, Rice bran oil
Citation
Kumar M S Sujith, Dahuja Anil, Rai R D, Walia Suresh, Tyagi Aruna. Role of γ-oryzanol in drought-tolerant and susceptible cultivars of rice (Oryza sativa L.). Indian Journal of Biochemistry & Biophysics. 2014 Feb; 51(1): 75-80.