Oxidative stress and change in plant metabolism of maize (Zea mays L.) growing in contaminated soil with elemental sulfur and toxic effect of zinc
Y. Cui, N. Zhaohttps://doi.org/10.17221/193/2010-PSECitation:Cui Y., Zhao N. (2011): Oxidative stress and change in plant metabolism of maize (Zea mays L.) growing in contaminated soil with elemental sulfur and toxic effect of zinc. Plant Soil Environ., 57: 34-39.
41 nmol/min/mg protein, respectively. However, CAT activity decreased from 1.96 to 1.48 µmol H2O2/min/mg protein. The concentration of malondialdehyde (MDA) in maize leaves significantly increased as the concentration of Zn increased. Moderate concentrations of S (32 and 160 mg/kg) alleviated the increase of both SOD and POD activity and the decrease of CAT activity that were observed under conditions of Zn stress. The greatest decrease of SOD and POD activity were 17% and 21% and both were observed in the treatment of 160 mg/kg S combined with 1000 mg/kg Zn. In this treatment, the greatest increase of CAT activity (11%) was also observed. The results suggest that moderate supplementation with S may ameliorate the toxicity caused by excess Zn and plays an important role in protecting plants from oxidative stress induced by excess Zn.
detoxification of heavy metals; senescence; antioxidant enzymes; lipid peroxidation; glutathione; reactive oxygen species; damage membrane