PRO / ANTIOXIDANT STATUS IN PLANTS OF SPRING WHEAT UNDER THE EFFECT OF DROUGHT AND STEVIOSIDE

This paper for the first time studies the effect of diterpene glycoside stevioside (10-8 M) on the redox status of 15-day spring seedlings in soil drought. Two types of spring soft wheat - Omskaya 33 (selected and recommended for cultivation in the Omsk region and Tatarstan of the Russian Federation) and Tamoz 2 (selected, certified and widely distributed in Iraq) were chosen as research objects. It was found that soil drought causes an increase in lipid peroxidation both in Omskaya 33 and Tamoz 2. Stevioside more strongly reduced the content of malonic dialdehyde against the background of water stress in Omskaya 33 that showed more active lipid peroxidation processes during drought. To determine the effectiveness of the antioxidant system in plant cells under drought conditions, the activity of antioxidant enzymes of ascorbate peroxidase, soluble peroxidase and catalase, as well as the content of a nonenzymatic antioxidant proline were determined. Soil drought stimulated the activity of the antioxidant enzymes studied. Preliminary treatment with diterpene glycoside with stevioside reduced the effect of water deficiency on the activity of antioxidant enzymes to a greater extent in Tamoz 2. Soil drought raises the proline level more in Tamoz 2 than in Omskaya 33, which may be due to the greater resistance of Tamoz 2 to water stress. Keywords: Triticumaestivum L., stevioside, drought, stability, lipid peroxidation, antioxidant enzymes, proline.