plants Article Comparison of Sugar Profile between Leaves and Fruits of Blueberry and Strawberry Cultivars Grown in Organic and Integrated Production System Milica Fotiri´cAkši´c 1,*, Tomislav Tosti 2 , Milica Sredojevi´c 3 , Jasminka Milivojevi´c 1, Mekjell Meland 4 and Maja Nati´c 2 1 Faculty of Agriculture, University of Belgrade, 11080 Belgrade, Serbia 2 Faculty of Chemistry, University of Belgrade, 11158 Belgrade, Serbia 3 Innovation Center, Faculty of Chemistry, University of Belgrade, 11158 Belgrade, Serbia 4 Norwegian Institute of Bioeconomy Research-NIBIO Ullensvang, 5781 Lofthus, Norway * Correspondence:
[email protected]; Tel.: +381642612710 Received: 13 May 2019; Accepted: 19 June 2019; Published: 4 July 2019 Abstract: The objective of this study was to determine and compare the sugar profile, distribution in fruits and leaves and sink-source relationship in three strawberry (‘Favette’, ‘Alba’ and ‘Clery’) and three blueberry cultivars (‘Bluecrop’, ‘Duke’ and ‘Nui’) grown in organic (OP) and integrated production systems (IP). Sugar analysis was done using high-performance anion-exchange chromatography (HPAEC) with pulsed amperometric detection (PAD). The results showed that monosaccharide glucose and fructose and disaccharide sucrose were the most important sugars in strawberry, while monosaccharide glucose, fructose, and galactose were the most important in blueberry. Source-sink relationship was different in strawberry compared to blueberry, having a much higher quantity of sugars in its fruits in relation to leaves. According to principal component analysis (PCA), galactose, arabinose, and melibiose were the most important sugars in separating the fruits of strawberries from blueberries, while panose, ribose, stachyose, galactose, maltose, rhamnose, and raffinose were the most important sugar component in leaves recognition.