Age-dependent morphophysiological changes and biochemical composition of Lactuca sativa L. plants influenced by se and solar radiation of varying intensity

Selenium, a micronutrient significantly involved in plant metabolism control, is also essential for human. Se regulates plant growth and protects plants from many adverse factors. The relevance of the issue is particularly high in biogeochemical provinces with selenium deficiency. Improvement of cultivation of greenhouse crops is also largely associated with optimization of the light regime. In this paper, we first reported on how selenite and selenate ions, in combination with intensity of UV-A + PAR, impact on growth and age-associated accumulation of primary and secondary metabolites in Laсtuca sativa L. plants. These results will contribute to a better understanding of signaling elements involved in metabolic regulation. Prior to sowing, the seeds were treated with 4 % sodium selenite or sodium selenate in test and with water in control. Light intensity and spectral characteristics were changed by covering a greenhouse with polyethylene films F1 and F2 (for F2, the UV-A transmission was 40-50 % higher and PAR was 30-35 % higher as compared to F1)...