This study was conducted to investigate the role of seed treatment with Reglalg (1/50 dilution) in mitigating the adverse effects of a 24-hour low positive temperature shock (LPTS) of 1°C in 2 maize hybrids, including early maize hybrid, Por. 180 and semi-early maize hybrid, Por. 310. The preventive treatment of the seeds before sowing with the preparation Reglalg contributed to the improvement of the functioning of the photosynthetic apparatus by increasing the content of chlorophyll pigments in the leaves of maize in the 5-6 leaf phase in the variants with the exposure of the seeds to the LPTS action of both hybrids, compared to the control seeds, treated with water. The use of Reglalg contributed to an increase in the grain yield of the Por. 310 in both variants - without and with the application of LPTS for seeds treatment in comparison with the controls, seed treatment with H2O and LPTS.