20.500.12556/RUL-185246 Flavonoids and fagopyrins in buckwheat leaves and flowers during the growing season and their relationship with weather conditions This study quantified how the concentrations of antioxidant flavonoids (particularly rutin and quercitrin), antioxidant activities, and phototoxic fagopyrin concentrations in buckwheat leaves and flowers varied during the growing season. In addition, the impact of meteorological variables (high and low temperature, sunshine, and precipitation) on these variations was investigated using pairwise Pearson correlation coefficients and corresponding false discovery rate (FDR)-adjusted p-values. The rutin concentration was 1.5-times higher, the antioxidant activity measured by the reducing power (RP) method was 5.1-times higher, and the fagopyrin concentration was 12.7-times higher in buckwheat flowers than in leaves during the peak flowering period. After peak flowering, the concentrations of phenolic compounds (but not fagopyrins) and antioxidant activities in the flowers sharply decreased. During 4-day dry periods, the RP antioxidant activity in buckwheat flowers was significantly positively correlated with both the average maximum temperature and the average minimum temperature. Weather conditions had no effect on fagopyrin accumulation in the flowers, but during dry periods there was a significant positive correlation between the average low temperature and fagopyrin concentration in the leaves. Although the observed correlations do not imply causation, they could be relevant for cultivation strategies to maximize the antioxidant capacity of harvested plant parts. fagopyrum esculentum antioxidant activity cultivation meteorology phenolic compounds antioksidativna aktivnost gojenje meteorologija fenolne spojine true false true Angleški jezik Slovenski jezik Članek v reviji 2026-07-30 07:18:34 2026-07-30 07:18:40 2026-08-10 10:13:10 0000-00-00 00:00:00 2026 0 0 11 str. iss. 1, art. 20251280 Vol. 21 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 61 2391-5412 10.1515/biol-2025-1280 270291715 RAZ_Tavcar_Eva_2026.pdf RAZ_Tavcar_Eva_2026.pdf 1 030AB5662934E28EA0318E221C5D30AD b54002734bf9c5a110b86873c14706cc8aa315d0299af192d0cd5147f65af3be 3b6ce301-8bd6-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=243585 https://www.degruyterbrill.com/document/doi/10.1515/biol-2025-1280/html 1 d9d6d4d4-8bd5-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=243579 Medicinska fakulteta Fakulteta za farmacijo 0 0 0