The effect of synthetic analogues of allelochemicals (coumarin, phenolic acids, amino acids, carboxylic acids) and phytohormones (kinetin, 6-benzyladenin) on adaptation of cress (Lepidium sativum L.) and wheat (Triticum aestivum L.) to the allelopathic stress modeled by coumarin solution was studied. The seed pretreatment with the solutions of amino, carboxylic and phenolic acids in low concentrations stimulated seedling resistance to phytotoxic doses of coumarin. At higher concentrations (1000—3000 mM) phenolic substances enhanced coumarin inhibitory effect on seed germination and root growth of seedlings. Carboxylic and amino acids did not display any inhibition on the characteristics of the test-plants growth and development within the tested range of concentrations.
Keywords: Lepidium sativum L., Triticum aestivum L., allelopathic stress, adaptation, seed pretreatment, phenolic acids, coumarin, cytokinins, carboxylic acids, amino acids
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