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The comparative analysis of the stimulating effect of low molecular weight heterocyclic compounds, derivatives of pyrimidine, pyrazole, isoflavones, pyridine, oxazolopyrimidine, oxazole and plant hormones auxins IAA (1H-Indol-3-ylacetic acid) and NAA (1-Naphthylacetic acid) on germination of seeds and growth of seedlings of flax (Linum usitatissimum L.) cultivars Ukrainian 3 and Svitanok was conducted. The specific auxin-like stimulating effect of chemical heterocyclic compounds on the basic processes of flax seedlings growth: cell division, cell proliferation, cell elongation and cell differentiation was found. The growth parameters of flax seedlings grown on water solution of chemical heterocyclic compounds used at the concentrations 10-8 M and 10-9 M were similar or higher of the growth parameters of flax seedlings grown on distilled water (control) or on water solution of auxins IAA and NAA used at the same concentrations 10-8 M and 10-9 M. The obtained results proved the possibility of practical application o f derivatives of pyrimidine, pyrazole, isoflavones, pyridine, oxazolopyrimidine and oxazole for intensification of vegetative growth of flax.

The comparative analysis of growth regulating activity of new synthetic low molecular weight heterocyclic compounds (LMWHC), derivatives of pyrimidine, and plant hormones auxins IAA(1H-Indol-3-ylaceticacid) and NAA(1-Naphthylaceticacid) on vegetative growth of tomato(Solanum lycopersicum L.)cultivar Fakel was conducted in the laboratory conditions. Our study showed that synthetic LMWHC, derivatives of pyrimidine used at the concentration 10-9 M demonstrated high auxin-like regulating activity on growth of tomato seedlings during the 8 weeks. The morphometric parameters of shoots and roots on the 8 thweek-old tomato seedlings grown in perlite moistened with solutions of synthetic LMWHC, derivatives o f pyrimidine used at the concentration 10-9 M were similar or higher to the morphometric parameters of shoots and roots on the 8 th-week-old tomato seedlings grown in perlite moistened with distilled water (control) or solutions of plant hormones auxins IAA and NAA used at the same concentration 10-9 M on average: to 21-30 %-for length of shoots, to 8-80 %-for average shoot mass, to 10-20 %-for length of main root, to 10-46 %-for average root mass, respectively. It was found that the plant growth regulating activity of these compounds depended on different substituents in the chemical structure of heterocyclic compounds. The obtained results proved the possibility of practical application of synthetic LMWHC, derivatives of pyrimidine as new effective regulators for vegetative growth of tomato(Solanum lycopersicum L.)cultivar Fakel.

The auxin-like and cytokinin-like activities of new chemical low molecular weight heterocyclic compounds, derivatives of pyrimidine, pyrazole, isoflavones, pyridine, oxazolopyrimidine and oxazole were studied. The specific bioassay on auxin-like activity showed high stimulating effect of the chemical heterocyclic compounds, derivatives of pyrimidine, pyrazole, isoflavones, and pyridine used at the concentration 10-8 M on the formation of adventitious roots on the 14 th-day-old leaf petioles isolated from seedlings of haricot bean (Phaseolus vulgaris L.) cultivar Belozernaya, which was similar or higher of the effect of plant hormones auxins IAA and NAA used at the same concentration 10-8 M. The specific bioassay on cytokinin-like activity showed the high stimulating effect of the chemical heterocyclic compounds, derivatives of pyrimidine, pyrazole, isoflavones, pyridine, oxazolopyrimidine and oxazole used at the concentrations 10-8 M and 10-9 M on the growth of biomass of 16 th-day-old cotyledons isolated from seeds of muscat pumpkin (Cucurbita moschata Duch. et Poir.) cultivar Gilea, which was similar or higher of the effect of plant hormone cytokinin Kinetin used at the same concentrations 10-8 M and 10-9 M. The obtained results proved the inducing auxin-like and cytokinin-like effect of synthetic heterocyclic compounds on plant cell elongation, division, and differentiation that are the basic processes of plant growth.