Assessment of drought resistance of alfalfa breeding material according to water regime indicators in the South of Ukraine

Purpose is to evaluate the plant breeding material of alfalfa by indices water metabolism in different conditions humidification, determine patterns their manifestation, correlation ties between them and drought tolerance, point out best for introduction into process. Methods. Field, laboratory, statistical. Results. During 2017–2020, 9 populations were studied regime: content tissues, deficit holding capacity leaves irrigation natural humidification. The regularities manifestation determined. By data on it was found that high at (81.88; 79.63; 78.42%) low (69.20; 70.81; 71.84%) without irrigation. Water closely related with deficit, but connection inverse (r = -0.986 r -0.863 humidification). highest (50.28–29.96–33.0%) stress (without irrigation) decreased plants 12.64–17.37–22.04%. relates leaves: greater lower capacity. In irrigated conditions, 13.9 17.3% lost 2 hours wilting 30.3–34.6% after 8 hours, 3.78–4.31% 1 hour. ranged from 82.7 85.9% wilting, 61.6 69.7% hours. first 8.5–11.7%, – 16.5–22.6%. loss per one hour 1.78 2.84%, 1.5–2.0 times less than plants. 82.3–91.5 77.0–91.5% respectively. It (90.3–91.5 83.4–91.5%) following populations: LRH, M.q./M.agr., A.r.d. M.agr.C. 1.78–2.15%. A hours: -0.652 -0.963, There a significant positive relationship tolerance 0.597–0.696). High (56.9–58.2%) recorded M.agr.C., LRH Ram. D. Conclusions. Regularities changes tissue content, during humidification revealed. relationships capacity, hol­ding selected be introduced