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A t present, it is known that the formation of plant resistance to stress factors occurs with the participation of a number of signal mediators. The role of calcium ions, reactive oxygen species (ROS) and nitric oxide in transduction of stress signals into genetic apparatus of a plant cell and formation of adaptive reactions is most studied [1][2][3].In recent years, hydrogen sulfide (H 2 S) has been considered as another inorganic mediating molecule both in animals [4] and in plant cells [5,6].Effects of endogenous hydrogen sulfide content increasing in plants under action of stressors, in particular, drought [7], salinity [8], heavy metals [9] were shown. An increase in content of hydrogen sulfide at treatment of maize seedlings with NO donors or hydrogen peroxide inducing heat resistance was revealed [10,11]. This indicates a close relationship between hydrogen sulfide, ROS and NO as signa ling molecules.Data have also been obtained that indicate the role of ROS in transduction of H 2 S signal. Increasing resistance of barley plants to UV-B by hydrogen sulfide donor was accompanied by an increase in content of hydrogen peroxide in leaves and this effect was eliminated by the H 2 O 2 scavenger dimethylthiourea [12]. We have previously shown that induced by the hydrogen sulfide donor NaHS increase in heat resistance of wheat coleoptiles was leveled by treatment with an antioxidant ionol [13]. At the same time, however, the role of ROS in realization of the effects of hydrogen sulfide as a physiologically active

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