decrease of cell defense mechanisms efficiency and oxidative stress accruing in lake of mg condition

a hydroponic experiment was conducted to investigate the effect of of magnesium (mg) deficiency on plant cell metabolism in pgs durum wheat cultivar. the experiment was conducted in 4 replications as a completely randomized design in 2010. result showed that magnesium deficiency increased reactive oxygen species (ros) production such as hydrogen peroxide (h2o2). furthermore, mg deficiency declined significantly the activity of ascorbate peroxidase (apx) and glutathione peroxidase (gpx) as well as total chlorophyll content. but catalase and superoxide dismutase (sod) activities were significantly increased under mg deficiency. outcome of these changes caused oxidative stress in plant cells and thus lead to increase damage of biological molecules. the increased of lipid peroxidation and cell death confirmed this opinion. the results showed there is a negative relationship between the antioxidant enzymes activity and cell membrane damage and ultimately cell death.