INFLUENCE OF LIGHT REGIMES IN COMBINATION WITH BACTERIA (BACILLUS SUBTILIS 10-4) ON THE LILIUM DECORATIVE QUALITIES

The purpose of research is to study the effectiveness of the action of different light spectra on the decorative qualities of Lilium×hybrid ‘Trendy Savannah’, inoculated with strains of endophytic bacteria Bacillus subtilis 10-4, in an enclosed space. Experimental cultures grew in five boxes (1.5 × 1.5 m), four of which were equipped with LED lamps with the following light modes: red (symbol R) – wavelength 660 nm; white (W) – 35 % blue (400–500 nm), 49 % medium (500–600 nm), 16 % red (600–700 nm); blue (B) – wavelength 460 nm; red + blue (R + B) – 70 % red (600–700 nm), 30 % blue (460 nm). The fifth box was the control variant with fluorescent lamps (Day L). The specificity in the formation of the vegetative and generative organs of the cultivar, as well as in the cycle of seasonal development, depending on the lighting options, was revealed. The earliest is the beginning of budding and the flowering phase, the longest flowering period is in the variant using bacteria in the blue light spectrum. An analysis of the growth dynamics made it possible to identify groups with different growth rates in different periods of vegetation: in the budding phase, with one and two growth peaks; in the flowering phase – with three peaks of growth. When assessing the decorative qualities of lilium on a 100-point scale, the maximum number of points was scored by the experimental variants using the blue and red spectra in combination with bacteria. Treatment with bacteria had a positive effect on flower size, inflorescence indicators (size, shape, number of flowers, density and regularity of flowers), abundance and duration of flowering in almost all variants. The results of a two-way analysis of variance showed that the greatest influence of the "light regime" factor was revealed for the following indicators: the width of the inner petals of the flower and the total number of flowers. To obtain a highly decorative lily material in indoor conditions, it is most promising to use the red + blue light spectrum in combination with B. subtilis 10-4 bacterial strains.