Izvestiya of Saratov University.

Chemistry. Biology. Ecology

ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)

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Assessment of Growth-Regulating Activity and Ecotoxicity of Diarylidene-Substituted Cyclohexanones

Rogachaeva Svetlana Michailovna, Yuri Gagarin State Technical University of Saratov
Zhutov Alexsandr S., Yuri Gagarin State Technical University of Saratov
Shilova Natalya A., Saratov State Medical University
Klochkova Iraida Nikolaevna, Saratov State University
Borisova Svetlana Vasilievna, Saratov State University

The search of new biologically active substances to be used as herbicides and plant growth regulators is carried out. The two compounds were used – 2-benzylidene-6-(m-nitrobenzylidene) cyclohexanone (1) and 2-benzylidene-6-(p-fluorobenzylidene) cyclohexanone (2). They are similar in structure, but containing different functional groups in one of the benzene rings: -NO2, and -F. Their dose-dependent effect on the germination and growth of Triticum aestivum and Barbarea vulgaris was investigated. High concentrations of the both substances completely suppressed seed germination (1 g/L) and inhibited the growth of seedlings of the plants (0.1 g/L). It was found that the compounds showed a growth-regulating effect on selected plant species in the concentration range of 0.0001–0.01 g/L. The compound 1 (0.001 g/L) significantly stimulated seed germination (15%) and seedlings growth of T. aestivum (70–100%), but the influence on the growth of B. vulgaris was lesser. Fluorine-containing compound 2 in the same concentration inhibited the stems growth of T. aestivum seedlings and suppressed the growth of B. vulgaris roots in the first days of experience. Ecotoxicological studies showed that a fluorine-containing compound is more toxic than a compound with a nitrogroup. According to the results of two biotests (S. quadricauda, D. magna), substance 2 at the concentration of 0.01 g/L showed acute toxicity. Both compounds in concentrations less than 0.001 g/L are non-toxic, i.e. they are environmentally safe and can be used as plant growth regulators.


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