Journal of Food, Agriculture and Environment

The influence of salinity stress on antioxidant activity in canola cultivars (Brassica napus L.)

Author(s):

Ahmad Bybordi ^1*, S. Jalal Tabatabaei ², Ali Ahmedov ¹

Recieved Date: 2009-09-23, Accepted Date: 2010-01-05

Abstract:

The effects of increasing salinity stress on plant growth and antioxidant enzymes in five cultivars of canola (cv. SLM₀₄₆, Okapi, Fornax, Licord and Elite) were investigated. Salt stress was imposed on 30-days-old cultivars with five different concentrations of NaCl (0, 50, 100, 150 and 200 mM). The shoots of Elite showed greater reduction in fresh weight, dry weight and water content when compared to the other cultivars with increasing salt stress. Under salinity stress, Elite exhibited higher Na:K ratio than the other cultivars. The activities of reactive oxygen species (ROS) scavenging enzymes and reduced glutathione (GSH) concentration were found to be higher in the leaves of SLM₀₄₆, whereas oxidized glutathione (GSSG) concentration was found to be higher in the leaves of Elite compared to the other cultivars. Our studies on oxidative damage in five canola cultivars showed lower levels of lipid peroxidation and H₂O₂ concentration in SLM₀₄₆ under salt stress conditions. High accumulation of proline and glycine betaine under salt stress was also observed in SLM₀₄₆ when compared to the other cultivars. Our data demonstrate that oxidative stress plays a major role in salt-stressed canola cultivars and SLM₀₄₆ has efficient antioxidative characteristics which could provide better protection against oxidative damage in leaves under salt-stressed condition.

Keywords:

Antioxidant enzymes, biomass, lipid peroxidation, salinity stress, canola, Brassica napus L

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 1
Category: Agriculture
Pages: 122-127

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