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COMPARATIVE EVALUATION OF DROUGHT RESISTANCE OF HEMEROCALLIS IN THE FOREST-STEPPE ZONE OF THE BASHKIR PRE-URAL

The paper presents the results of studies of the peculiarities of the water regime and drought resistance of 6 species of the genus Hemerocallis L. introduced into the South-Ural Botanical Garden-Institute of Ufa Federal Research Center of Russian Academy of Sciences. The objects of study were H. citrina Baroni, H. dumortieri E. Morren, H. fulva (L.) L., H. lilioasphodelus L., H. middendorffii Trautv. et C. A. Mey., H. minor Mill. The experiments were carried out during the growing seasons of 2020-2021 on the basis of the laboratory for the introduction and selection of flowering plants. In the course of the experiments, the seasonal dynamics of such indicators of the water regime as total water content, water retention capacity and water deficiency in leaves of Hemerocallis were determined. The analysis of the parameters of the water regime is based on the method of artificial wilting and the method of saturation of plant samples. The data obtained were processed using standard statistical methods using Microsoft Excel 2003. As a result of the research, based on the average values of water holding capacity, total water content and water deficit, we developed a scale for changing the parameters of the water regime of leaves for a comparative assessment of the drought resistance of Hemerocallis, which makes it possible to differentiate daylily taxa into groups with varying degrees of drought tolerance (high, medium and low). Thus, H. citrina and H. fulva were assigned to the group with a high degree of drought tolerance; H. dumortieri, H. lilioasphodelus, H. middendorffii, H. minor were assigned to the group with an average degree of drought tolerance. Under the same soilclimatic and agrotechnical conditions, the range of indicators of the total water content of Hemerocallis was 68.8-83.6%, water-holding capacity - 19.8-65.1, water deficit - 2.2-13.62%. In general, all the studied species of daylily are promising for cultivation in the forest-steppe zone of the Bashkir Pre-Ural.