Increasing anthropogenic impact on the environment leads to a decrease in the biocenosis’ productivity. On the background of increasing use of mineral fertilizers with phosphate compounds by the agrarian sector and, consequently, soil contamination with cadmium micro additives, the use of nanoparticles of metals-micronutrients is considered as an alternative source of nutrition of important crops. The effect of pre-sowing treatment with a mixture of Cu, Zn, Mn, Fe nanoparticles and 0,1 mM Cd2+ on lettuce (Lactuca sativa L.) plants of two different in the phenolic metabolites accumulation varieties (phenotypically differing in the degree of pigmentation of the above-ground part — Lolo (green variety), Lolo Ross (red variety) — was investigated. It was studied the adaptive response of Lactuca sativa plants based on the analysis of the content of primary products of lipids peroxidation (hydroperoxides), and the activation of enzymatic (guaiacol-peroxidase and phenylalanine ammonia-lyase activity), and non-enzymatic (content of phenolic compounds) antioxidant systems. The specificity of the influence of essential metal nanoparticles and high content of cadmium has been determined. An additional to metal nanoparticles load with cadmium resulted in the accumulation of phenolic metabolites (36 %) and phenylalanine ammonia-lyase activity increase (twice) in the green variety Lolo, compared to the red Lolo Ross variety. However, both varieties showed a decrease in the level of lipids peroxidation products at the end of the exposition. It was established the absence of the leveling effect of nano-treatment on the toxic cadmium effect in both varieties.
Keywords: Lactuca sativa L., cadmium ions, essential metal nanoparticles, lipid hydroperoxides, guaiacol peroxidase, phenolic compounds, phenylalanine ammonia-lyase
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