with the same cation stimulated root and shoot growth to a lesser extent, it can be predicted that the plant growth-stimulating effect observed for 4Asp and 4Ala is a product of the beneficial effect of the 1-(2-hydroxyethyl)quinium cation and the enhancement of metabolism caused by exogenous application of proteinogenic amino acids . It should also be emphasized that the growth-stimulating activity of quinine in terrestrial plants has not yet been studied in detail, and thus further research of this phenomenon is recommended.