Dynamics of Flavonoid Accumulation During the Flowering Phenological Phase of Narrow-Leaf Vetch (Vicia angustifolia L.) under Saline Soil Conditions

In this study, the dynamics of flavonoids during the flowering phenological phase of narrow-leaf vetch (Vicia angustifolia L.) grown on weak and moderately saline soils of the Syrdarya region was studied. The content of apigenin, gallic acids, kaempferol, quercetin and rutin was determined in the leaves, stems and roots of this plant using high-performance liquid chromatography (HPLC). Gallic acid levels in narrow-leaf vetch grown in moderately saline soils increased to 173.479 mg/L in the leaves, 157.502 mg/L in the stems, 142.645 mg/L in the roots, and 157.013 mg/L in the flowers. Kaempferol content reached 12.242 mg/L in the leaves and 12.706 mg/L in the flowers, but decreased to 12.245 mg/L in the stems and 12.007 mg/L in the roots. Quercetin increased to 48.623 mg/L in the flowers under moderately saline conditions, was not detected in the roots, decreased to 29.707 mg/L in the leaves, and was absent in the stems under weakly saline soil. Level of increased to 148.286 mg/L in the leaves and 56.728 mg/L in the flowers under moderately saline soil conditions, but decreased to 114.731 mg/L in the stems and 54.975 mg/L in the roots. In conclusion, these changes indicate the role of flavonoids in plant adaptation to salinity stress and open up opportunities for optimizing the cultivation of narrow-leaf vetch as a cover crop in saline areas. Keywords: Adaptation, flavonoids, narrow-leaf vetch, quercetin, salinity stress.