Screening of growth-simulating activity of synthetic compounds - pyrimidine derivatives

Abstract

New synthetic compounds — pyrimidine derivatives — were screened to select the most effective of them, which show a growth-regulating activity in plants. Their action was compared with phytohormones of the auxin class. In particular, the effect of synthetic compounds on the seed germination, growth, and development of tomato (Solanum lycopersicum L.) plants of Lagidny variety in vivo and in vitro was studied. It was found that some of the studied compounds have a positive effect on the morphometric and biochemical parameters of 30-day-old plants: compounds D1-D5 increased seed germination up to 9-27 %, the most effective among them was compound D1. Compounds D1 and D2 increased the height of the shoots up to 29 %. All the studied compounds effectively influenced the rooting of plants, increasing either the length of the roots (up to 8 %) or their number (up to 25 %), the most effective among them was the compound D2. The effect of these compounds on the morphogenetic potential of tomato explants was studied in vitro for the first time. It was found that compounds D1 and D2 were the most effective for the direct plant regeneration. Screened compounds can be further recommended for the use in various biotechnological programs for genetic improvement of tomatoes.