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

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2007, v.30 no.4, pp.307-314



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Abstract

(superoxide dismutase, catalase and peroxidase) activity in leaves and roots of rice (Oryza sativa L.) plants ex-posed 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.

keywords
Catalase, Oxidative stress, Peroxidase, Rice, Salinity, Superoxide dismutase

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(2007) Received October 23 2007 Accepted November 21 2007,

Journal of Ecology and Environment