Search for physiologically active compounds among synthesised organic substances of the quinoline series

Various chemicals, growth regulators, stimulating and accelerating the development of plants are introduced into production. Therefore, the search for physiologically active compounds (FAS) and their effective concentrations is relevant. The aim of the work is to study the effect of 6-hydroxy-2,2,4-trimethyl-1,2-tetrahydroquinoline, 6-hydroxy-2,2,4-trimethyl-1,2-dihydroquinoline and its derivatives on the growth of yellow rhododendron (Rhododendron luteum Sweet) and sugar beet (Beta vulgaris L.) to expand the range of application of compounds. The work was carried out in 2018 and in 2021 in the Voronezh region. The studied FAS were divided into tetrahydroquinolines: 6-hydroxy-2,2,4-trimethyl-1,2-tetrahydroquinoline (FAS 1), its derivative FAS 3; dihydroquinolines: 6-hydroxy-2,2,4-trimethyl-1,2-dihydroquinoline (FAS 2) and its derivatives FAS 4 and FAS 5. Each compound was tested on rhododendron yellow in concentrations of 0.01, 0.05, 0.10 %. Sugar beet seeds were treated with 6-hydroxy-2,2,4-trimethyl-1,2-dihydroquinoline at the same concentrations. For Rh. luteum dihydroquinolines are more effective and, to a lesser extent, tetrahydroquinolines. The increase in the height of Rh. luteum seedlings relative to the control after FAS seed treatment in different concentrations was 18.2…54.5 %, and the height of seedlings was 3.0…61.2 % relative to the control. This fact indicates the long-term preservation of the stimulating effect of synthesized organic substances on the growth of yellow rhododendron. In all variants of concentrations of aqueous solutions of 6-hydroxy-2,2,4-trimethyl-1,2-dihydroquinoline, stimulation of sugar beet growth indicators after pre-sowing treatment of undrafted seeds was noted: the length of the leaf blade increased by 5.5…11.7 %, the width of the leaf blade – by 6.5…16.3 %, the number of leaves – by 7.7…20.5 %, the length of the leaf blade petiole – by 14.8…20.3 %, plant survival – by 7.5…11.5 %, relative to the control.