In the dissertation, we studied the metabolic response of chilies (Capsicum spp.) based on species, cultivar, fruit position on the plant, and three fruit parts (pericarp, placenta, seed). Primary and secondary metabolites and enzymatic activity were studied in chilies exposed to different abiotic and biotic stressors and treated with different biostimulants based on hydrolyzed animal protein and algal extracts. The different fruit parts of chilies are very different in terms of primary and secondary metabolites. The differences between species and cultivars were greatest in the content of phenols and capsaicinoids. The metabolic response of chilies to drought, salinity, and pest infestation was higher at the level of secondary metabolites (phenols, capsaicinoids) than at the level of primary metabolites. Drought affected the uptake and translocation of nitrogen by the plant, which also affected the metabolism of the metabolites analyzed. By using different biostimulants, we studied the response of chili at enzymatic and metabolic levels. The response of chili occurred at the enzymatic level in the first hour after application and at the metabolic level in the pericarp and placenta in the next three hours. The effect on secondary metabolism was stronger than on primary metabolism. The efficacy of the biostimulant increases with increasing salt concentration.
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