title: Role of gamma-oryzanol in drought-tolerant and susceptible cultivars of rice (Oryza sativa L.).
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 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.
authors.forename: M S Sujith
authors.initials: MS
authors.lastname: Kumar
authors.forename: Anil
authors.initials: A
authors.lastname: Dahuja
authors.forename: R D
authors.initials: RD
authors.lastname: Rai
authors.forename: Suresh
authors.initials: S
authors.lastname: Walia
authors.forename: Aruna
authors.initials: A
authors.lastname: Tyagi
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D055864:Droughts; D012275:Oryza / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D010666:Phenylpropionates / Q000302:isolation & purification / Q000378:metabolism*; D010938:Plant Oils / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010666:Phenylpropionates; D010938:Plant Oils; C013172:gamma-oryzanol