V tejto bakalárskej práci bola prostredníctvom ortovanadátu sodného skúmaná aktivita protónových púmp v semene Arabidopsis thaliana, ktoré bolo vystavené soľnému stresu, v závislosti na aktivite fotoreceptoru CRY1 a kvalite svetla. Experimenty prebiehali in vitro v tme, na modrom a na červenom svetle. Bol využitý mutant cry1-1 v géne pre skúmaný fotorecptor CRY1 a odpovedajúci nemutovaný ekotyp Ler (Col).In this bachelor thesis, theactivity of proton pumps in Arabidopsis thaliana seed exposed to salt stress was investigated using sodium orthovanadate in relation to the activity of photoreceptors CRY1 and light quality. The experiments were conducted in vitro in darkness, in blue and red light. In the experiments, cry1-1 mutant defective in the gene coding for the CRY1 photoreceptor and corresponding non-mutated ecotype Ler (Col) were used.