The effects of foliar feeding with the complex of trace elements chelated by succinic acid on the activity of antioxidant enzymes of chloroplasts, the total pool and de-epoxidation state of pigments of the xanthophyll cycle in the flag leaf at the stage of milk and milk-waxy ripeness as well as the grain productivity of winter wheat were studied. It has been established that treatment with chelated micronutrients increased the activity of superoxide dismutase and ascorbate peroxidase in chloroplasts and promoted the preservation of higher content of chlorophyll in the leaf during the period of grain filling. At the same time, there were no significant changes in the content and degree of de-epoxidation of pigments of the xanthophyll cycle. The increase in crop yield at feeding by microfertilizer was associated with a greater number of productive shoots per unit of land area — 318±23 per m2 and 301±16 per m2 in Favorytka and Smuglianka varieties respectively for the control, and 397±6 per m2 and 390±16 per m2 respectively for treatment. The grain yield increased from 6.58±0.25 t/ha and 5.55±0.25 t/ha in control plants of varieties Favorytka and Smuglianka to 8.02±0.18 t/ha and 6.69±0.45 t/ha in treated plants, respectively. The increase in grain productivity due to foliar top-dressing by avatar-1 amounted about 21 % as compared to the control. Feeding plants of winter wheat with a complex of trace elements, chelated with succinic acid, helps to maintain the functional state of their photosynthetic apparatus due to better antioxidant protection of the flag leaf tissues during the period of grain filling and results in the rise of grain productivity
Keywords: Triticum aestivum L., winter wheat, chlorophyll content, chelated microfertilizers, superoxide dismutase, ascorbate peroxidase, xanthophyll cycle
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