Biological Systems: Theory and Innovation

Varieties of narrow-leaved lavender, which have high potential productivity, are zoned on the territory of Ukraine, but due to the variability of the temperature regime and the amount of annual precipitation, it is not fully realized. This causes selectioners to create and introduce into production varieties with high environmental plasticity and resistance to stressors. Today in Ukraine large areas of arable land, especially the steppe zone suffer from insufficient moisture, which leads to 30-50% crop failure, especially in dry years. Therefore, it is especially important to study the physiological and biotechnological aspects of drought resistance of lavender for selection work aimed at creating new, productive varieties adapted to conditions of insufficient humidity. We used modified Murashige and Skoog nutrient media supplemented with different concentrations of cytokinins and osmotically active substances. The content of polyethylene glycol 12000 at a concentration of 7.5% creates sufficiently stressful conditions to obtain drought-resistant lavender lines. At the same time, there is a slowing down of the root forma on process, which significantly affects the me required to obtain and adapt stable lines of lavender. Rhizogenesis is much slower, and the root system is less developed, compared with the root system of plants grown on a medium without polyethylene glycol. Alternatively, a nutrient medium with a 5% concentration of PEG can be used. Thus, the percentage of drought-resistant adapted planting material will be higher, although the degree of adaptation to arid conditions will be lower. It is established that the drought factor affects not only the growth of vegetative mass of plants, but also delays their morphogenetic processes. Thus, at high concentrations of osmotic agents in the nutrient medium rhizogenesis occurred only in some samples and with a significant delay

narrow-leaved lavender; in vitro culture; morphogenesis; drought resistance