Background: Climatic optimum, unfortunately, is often an inaccessible condition for growing plants. The reaction of plants to temperature stress determines the area of growth of each individual species, and also affects the process of acclimatization of plants in a particular region. The main purpose of the study was the investigation of a number of physiological and biochemical, as well as molecular and genetic reactions of the wild plant Arum Korolkowii to high-temperature effects of different intensity.