Influența portaltoiului și a încărcăturii la butuc asupra conținutului de compuși biologic activi în vinurile roșii seci obținute din soiul Codrinschi

The study focused on evaluating the content of biologically active substances in dry red wines obtained from the new grape variety Codrinschi, in relation to the rootstock used and the vine load applied during cultivation. The research was conducted at the Scientific-Practical Institute of Horticulture and Food Technologies (SPIHFT), using grapes harvested in 2023 from the vineyards of SA "Terra-Vitis" (Burlacu village, Cahul district) and vinified under microvinification conditions. Twelve wine samples were analyzed, originating from vines grafted on three different rootstocks (Riparia×Rupestris 101-14, Berlandieri×Riparia SO4, and Kober 5BB), each subjected to different levels of vine load. Quantitative determinations were performed using HPLC and spectrophotometric methods, targeting phenolic compounds with antioxidant potential, such as catechins, epicatechins, resveratrol, quercetin, rutin, proanthocyanidins, as well as the anthocyanin profile. The results showed that the Berlandieri×Riparia Kober 5BB rootstock favored the highest accumulation of bioactive compounds. Additionally, an inverse relationship was observed between productivity level and the concentration of these compounds, highlighting the need to maintain an optimal balance between yield and quality. The conclusions underline the crucial role of rootstock selection and vine load management in enhancing the biological value of dry red wines produced from newly selected grape varieties.