Effects of Rootstocks on Sugar and Organic Acid Contents of 'Deveci' Pear

The aim of present study was to determine the effects of three rootstocks [quince BA 29 and EMC (Cydonia oblonga), and seedling of P. communis] on sugars and organic acid contents in 'Deveci' pear (Pyrus communis L.) cultivar during 20112015 years. In the study, oxalic, tartaric, malic, ascorbic, acetic, citric, fumaric and propionic acid as organic acids and fructose, sucrose, glucose and total sugar as sugars in the fruit samples were investigated in terms of rootstocks. Major organic acids for 'Deveci' pear were malic, ascorbic and propionic acids. Malic and ascorbic acid in BA 29 rootstock were higher than EMC and seedling rootstocks. Contrarily, propionic acid was higher in seedling rootstock. In terms of malic acid, BA 29 had the highest malic acid content (3425.3 mg 100g-1) while seedling rootstock had the lowest amount (2976.5 mg 100g-1). Significant differences were observed between rootstocks for tartaric, ascorbic, acetic, citric and fumaric acids. Tartaric, ascorbic, citric and fumaric acids in BA 29 and EMC rootstock were higher than the content of seedling rootstock. The most abundant sugars in 'Deveci' pear were fructose (32.4, 39.27 and 42.4 g kg-1 fw, respectively) and glucose (18.7, 22.3 and 26.7 g kg-1 fw) for BA 29, EMC and seedling rootstocks. The total sugar content of the seedling rootstock (74.0 g kg1 fw) was higher than BA 29 (53.0 g kg-1 fw) and EMC (65.8 g kg-1 fw)

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