XVI International Botanical Congess

Crops resistance to drought is the most important trait for the selection of initial and processing material. Plant respond to environmental stresses with various physiological and biochemical changes having adaptive value.Comparison spring barley samples on the level of osmoprotectant concentrations and isoperoxidase activity in 12 days seedlings under artificial heat and water deficit conditions was the purpose of this study. Response of plants to type of stress was different on the activity of isoperoxidase fast moving by the alkaline electrophoretic system. Activity of isozyme with relative electrophoretic mobility 100% was stable at heat resistant samples. Water deficit strongly increased the activity of isozyme with REM 93% of all barley samples.