Dynamics of morpho-physiological parameters of lesser duckweed (Lemna minor) under heavy metals cultivation

Abstract

The effect of metal cations of copper (II), iron (II), lead and zinc in the concentration range from 0,1 to 10,0 mg/l on the morphological and physiological parameters of duckweed freshwater plants was studied in this work. The specific growth rate and the dynamics of changes in the total area of leaf blades were taken as morpho-physiological indicators. It was shown that for Cu 2+ and Fe 2+ cations in the concentration range of 0,1–0,25 mg/ml, the duckweed growth rate did not differ from the control, while zinc and lead cations had 17,3 % and 30 % inhibitory effects. effect, respectively. In the concentration range of 0,5–2,5 mg/l, it was shown that the effectiveness of the inhibitory effect on the growth of duckweed decreased in the series Zn 2+ > Pb 2+ > Fe 2+ > Cu 2+ , which was also confirmed by data on the dynamics of the decrease in the ratio of the average areas of leaf blades before and after 7 days of cultivation. The results of the work show that duckweed (Lemna minor) can be used in bioindicative measures in relation to the content of elements of the group of heavy metals (copper (II), iron (II), lead and zinc) in water bodies.