• Title/Summary/Keyword: Oryza

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A Comparison of Inhibitory Effects in Brown and White Rice ( Oryza sativa L. ) against Mutagenicity Induced by Tryptophan Pyrolysates (트립토판 열분해물 유발 변이원성에 대한 현미 및 백미의 억제 효과 비교)

  • Jo, Jeong-Sun;Yu, Jeong-Eun;Jeon, Hyang-Suk
    • Journal of the Korean Dietetic Association
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    • v.3 no.2
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    • pp.105-111
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    • 1997

  • The inhibitory effect of rice(Oryza sartiva L., illpumbyeo) against mutagenicity induced by tryptophan pyrolysates were investigated using Salmonella typhimurium reversion assay. Both methanol extracts of obtained from brown and white rice were found to possess strong activites of inhibiting the mutagenicities of 3-amino-1,4-dimethyl-5H-pyriod[4,3-b]indol(Trp-P-1) and 3-amino-1-methyl-5H-pyrido[4,3-b]indol(Trp-P-2) on Salmonella typhimurium reversion assay. As the concentration of methanol extract increased, inhibitory effect on mutagenicity increased but reached at steady state as inhibition rate of 90% when the concentration was above 10mg/plate. There was no significant difference(p>0.05) in inhibitory effect of methanol extracts between brown and white rice against tryptophan pyrolysates.

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Changes in ROS-Scavenging Enzyme Activity in Rice (Oryza sativa L.) Exposed to High Salinity

  • Koo, Jeung-Suk;Choo, Yeon-Sik;Lee, Chin-Bum
    • Journal of Ecology and Environment
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    • v.30 no.4
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    • pp.307-314
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    • 2007

  • We studied changes in the biochemical and physiological status and ROS-scavenging enzyme (superoxide dismutase, catalase and peroxidase) activity in leaves and roots of rice (Oryza sativa L.) plants exposed to high salinity. Under salt stress, the reduction in RWC (relative water content) in leaves was relatively severe in comparison with that of roots. The proline content was also significantly higher in leaves of rice plants following salt treatment. The activities of CAT and POX in roots increased with increasing NaCl concentration, but the activity of SOD decreased. These results suggest that the increase of endogenous proline is closely associated with the increase of CAT and POX activities, which may play important roles in salt tolerance. Therefore, we conclude that the alleviation of oxidative damage and increased resistance to salinity may result from the presence of efficient antioxidative systems.

  • https://doi.org/10.5141/JEFB.2007.30.4.307 인용 PDF KSCI