Screening of Synthetic Auxin-Like and Cytokinin-Like Compounds, Derivatives of Thioxopyrimidine as New Plant Growth Regulators

Abstract

This study is devoted to the development of new plant growth regulators based on synthetic low-molecular nitrogen-containing heterocyclic compounds, derivatives of thioxopyrimidine. The regulatory activity of synthetic compounds, derivatives of thioxopyrimidine was studied at the vegetative stage of wheat plants. A comparative analysis of plant growth regulatory activity was carried out between plant hormones such as auxin 1-Naphthylacetic Acid (NAA) and cytokinin N-(2-Furylmethyl)-7H-purin-6-amine (Kinetin), known synthetic compounds such as derivatives of sodium and potassium salts of 6-methyl-2-mercapto-4-hydroxypyrimidine (Methyur, Kamethur) and new synthetic compounds such as derivatives of thioxopyrimidine. Morphometric parameters such as average shoot and root length (mm), average biomass of 10 plants (g) and biochemical parameters such as photosynthetic pigment content (mg/g FW) of wheat plants were measured at the 3^rd week of the vegetative phase. As a result of the screening, new synthetic compounds, derivatives of thioxopyrimidine were selected that showed regulatory activity on morphometric and biochemical parameters of wheat plants that was similar to or exceeded the regulatory activity of auxin NAA and cytokinin Kinetin or the synthetic compounds, derivatives of sodium and potassium salts of 6-methyl-2-mercapto-4-hydroxypyrimidine (Methyur, Kamethur). The hormone-like specificity and selectivity of the regulatory activity of new synthetic compounds, derivatives of thioxopyrimidine, on wheat growth are discussed. An analysis of the relationship between plant growth regulatory activity and the chemical structure of synthetic compounds, derivatives of thioxopyrimidine, was carried out. Selected synthetic compounds, derivatives of thioxopyrimidine, which showed the highest auxin-like and cytokinin-like regulatory activity, are proposed for use in the agricultural industry as new wheat plant growth regulators.

Keywords:Triticum aestivum L; NAA; Kinetin; Methyur; Kamethur; Thioxopyrimidine derivatives