Paper Details

The effects of exogenous salicylic acid in the antioxidant defense system in canola plants (Brassica napus L.) exposed to copper

Saideh Khademi, Ramazan Ali Khavari-Nejad, Sara Saadatmand, Farzaneh Najafi

DOI: http://dx.doi.org/10.12692/ijb/5.2.64-73

Int. J. Biosci. 5(2), 64-73. July, 2014. (PDF)

Abstract:

With the aim of assaying the possible interactions of copper (Cu) and salicylic acid (SA) in canola, the present research was conducted.Plants were treated withfour concentrationsof CuSO4.4H2O (0, 50, 75, and 100 µM), and/or two levels of SA(0 and 250 µM).Proline contents in leaves were significantly increased by Cu treatments, in contrast to SA. Proline contents in roots were reduced by copper treatments, especially the mixed treatments with SA, while the individual application of SA was the most significant effective one. The Cu induced lipid peroxidations were significantly alleviated by the foliar application of SA. SA and/or Cu had significantly increasing effects on H2O2 contents in the root and leaf tissues. SA accelerating effects on the activities of peroxidase (POD) in root tissues were more effective than Cu, in contrast to leaf. The promoting impacts of individual applied levels of Cu on the leaf catalase (CAT) activities were declined by the exogenous SA. As opposed to SA, Cu application resulted in reductions in the root CAT activities. The activities of superoxide dismutase (SOD) were significantly elevated by the applied concentrations of Cu in the both root and leaf organs, as opposed to SA induced changes. In conclusion, it seems that the exogenous supplementation of SA may ameliorate the damaging effects of copper stress.