Affiliation:
1. Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy
2. Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy
Abstract
High-density olive groves, despite their interesting production potential, have several limitations, including their high fruit load and irrigation requirements. This study aimed to evaluate the effects of fruit load and deficit irrigation on oil yield, fruit quality, and olive chemical composition in a high-density olive grove (cv Sikitita). Our main hypothesis was that primary metabolism, as influenced by crop load and stress, could modify the accumulation of different phenolic classes. Different fruit loads were generated through flower thinning (66%, 50%, 33%, 0%), and two deficit irrigation treatments (−60%, −75%) were compared to the well-watered control (920 m3/ha). Thinning treatments had a limited effect on oil yield; on the other hand, deficit irrigation caused considerably less oil accumulation in the fruit on all sampling dates. Thinning 66% and deficit irrigation 75% were considered with the control for untargeted metabolomic analysis, including three sampling dates. A total of 233 distinct phenolic compounds were annotated. Multivariate HCA results indicated that harvest time had an impact on the phenolic profile of olive fruits, obtaining two separated clusters that grouped t1 and t2 together and apart from t3, which clustered independently. Regarding agronomic techniques, they played a differential role in the phenolic profile (supervised OPLS-DA). Fruit load mostly affected flavonoid glycosides. In contrast, the phenolic response to deficit irrigation was more heterogeneous, with phenolic acids (35%), flavonoids (25%), LMW, and other phenols (25%).
Reference65 articles.
1. Protective effects of oleic acid and polyphenols in extra virgin olive oil on cardiovascular diseases;Lu;Food Sci. Hum. Wellness,2024
2. (2024, January 02). EC—European Commission, Expert Group for Agricultural Markets—Arable crops and olive oil. Market Situation in the Olive Oil and Table Olive Sectors. Available online: https://agriculture.ec.europa.eu/system/files/2023-12/market-situation-olive-oil-table-olives_en.pdf.
3. D’Adamo, I., Falcone, P.M., Gastaldi, M., and Morone, P. (2019). A social analysis of the olive oil sector: The role of family business. Resources, 8.
4. Life cycle assessment of olive oil: A case study in southern Italy;Guarino;J. Environ. Manag.,2019
5. Lombardo, L., Farolfi, C., and Capri, E. (2021). Sustainability certification, a new path of value creation in the olive oil sector: The Italian case study. Foods, 10.