A biological testing of new synthetic heterocyclic compounds – 2,4,6-triphenyl-3,5-dichloropyridine and 2,6-diphenyl-3-chloropyri- dine differing more halogen atoms and phenyl fragments of the pyri- dine ring. The compounds were first obtained at the Department of Organic and Bioorganic Chemistry National Research Saratov State University. The objects of the study were the seedlings of spring wheat TriticumaestivumL. The test solutions had a positive effect on the rate root-maintenance seedlings in all variants of the experiment. There is a positive effect of the growth and development of the root system. In this case 2,6-diphenyl-3-chloropyridine promotes root development by increasing the number of roots and the weight accumulation, and 2,4,6-triphenyl-3,5-dichloropyridine exerts significant catalytic effect on the total length of seedling roots. A positive effect of 2,6-diphenyl- 3-chloropyridine first sheet on the growth and development in length of the leaf plate. Presowing treatment of 2,6-diphenyl-3-chloro-pyridine solution at a concentration of 10-12М improves seed germination en- ergy, providing friendly shoots; and stimulates the development of the root system. Thus, without affecting the length of the first sheet gen- erally inhibits the development of leaf plate and stimulates the growth of leaf sheath. Study of the effect on the weight of the test solutions plantlet showed that pre-treatment of seeds has an inhibitory effect on the accumulation of green mass, and exerts a stimulating action on the root mass of the system (except for the solutions in a concentration of 10-6 M). To study the effect of 2,4,6-triphenyl-3,5-dichloropyridine and 2,6-diphenyl-3-chloropyridine seedling photosynthetic appara- tus for quantitative analysis was conducted of the pigment com- position of the first sheet plate. When cultured in the solution of the test object is observed increase in the ratio of chlorophyll a to chlorophyll b with respect to the control values. Pretreatment of seeds negatively affected the content of carotenoids. Analysis of the data suggests that 2,6-diphenyl-3-chloropyridine, and 2,4,6-triphe- nyl-3,5-dichloropyridine exhibit growth regulating activity.