New Auxin and Cytokinin Related Compounds Based on Synthetic Low Molecular Weight Heterocycles

Abstract

AbstractOur chapter is devoted to the biological screening of new effective substitutes of plant hormones auxins and cytokinins among synthetic low molecular weight heterocyclic compounds, derivatives of pyridine, pyrimidines, pyrazolotriazinones, oxazoles, oxazolopyrimidines and isoflavonoids. The auxin-like and cytokinin-like activity of chemical low molecular weight heterocyclic compounds, derivatives of pyridine, pyrimidine, pyrazole, isoflavones, oxazolopyrimidine and oxazole was studied. A specific bioassay on auxin-like activity showed a high stimulating effect of the chemical heterocyclic compounds, derivatives of pyridine, pyrimidine, pyrazole and isoflavones used at the concentration 10–8 M on the formation of adventitious roots on the 14th-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. A specific bioassay on cytokinin-like activity showed a high stimulating effect of the chemical heterocyclic compounds, derivatives of pyridine, pyrimidine, pyrazole, isoflavones, oxazolopyrimidine and oxazole used at the concentrations 10–8 M and 10–9 M on the growth of biomass of 16th-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 results obtained confirmed the inducing auxin-like and cytokinin-like effect of chemical low molecular weight heterocyclic compounds, derivatives of pyridine, pyrimidine, pyrazole, isoflavones, oxazolopyrimidine and oxazole on plant cell elongation, division, and differentiation that are the basic processes of plant growth. The practical application of derivatives of pyrimidine, pyrazole, isoflavones, pyridine, oxazolopyrimidine and oxazole as new plant growth regulators was proposed.KeywordsPlant hormonesIAANAAKinetinPyridinePyrimidinePyrazoleIsoflavonesOxazolopyrimidineOxazolePhaseolus vulgaris L.Cucurbita moschata Duch. et Poir