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The importance of the physiological role of nutrient elements in plant behavior concerning higher and more stable yield, using the durum wheat variety P1252 as model plant, was examined under hydroponic conditions. To investigate the effects of Mg deficiency, the element was eliminated from the media solutions. Results showed that Mg elimination decreased the chlorophyll content. Lack of Mg only affected guaiacol peroxidase (GPX) and catalase (CAT) activities significantly. The SOD/APX+GPX+CAT ratio as an index of assessing the balance between H 2 O 2 -producing and H 2 O 2 -scavenging enzymes increased leading to the accumulation of H 2 O 2 in cell. The elevation of SOD/APX+GPX+CAT ratio and H 2 O 2 accumulation indicates the occurrence of oxidative stress in leave cells under Mg deficiency. Lack of magnesium (Mg) resulted in considerable increase in other oxidative stress indices, cell death and Malondialdehyde (MDA). The reason is the occurrence of Haber-Weiz reaction in absence of Mg and production of hydroxyl radical, a very dangerous radical, leading to increasing damage of cell biomolecules and their apoptosis.

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