ISHS Acta Horticulturae 514: XXV International Horticultural Congress, Part 4: Culture Techniques with Special Emphasis on Environmental Implications
FREE SUGAR AND SORBITOL CONTENT IN PEAR (PYRUS COMMUNIS L.) CV. 'WILLIAMS' DURING FRUIT DEVELOPMENT USING DIFFERENT TREATMENTS |
| Authors: | M. Hudina, F. Stampar |
| Keywords: | Pyrus communis L., fructose, glucose, pear, sorbitol, sucrose, sugar |
| Abstract:
Changes of the sugar (fructose, glucose and sucrose) and polyol (sorbitol) content in fruits of pear (Pyrus communis L.) cv. 'Williams' were studied from fruit set to maturity using High Performance Liquid Chromatography (HPLC). Experiment included 6 treatments: non-irrigated (control, defoliation, foliar fertilization) and irrigated (control, defoliation, foliar fertilization). Different treatments influenced the content of individual sugars and sorbitol. Glucose content decreased from 1st sampling (1st June) to maturity (17th August) in non-irrigated control (14.56 mg/g to 6.75 mg/g). In non-irrigated defoliation glucose content decreased to 4.55 mg/g at picking. Content of fructose increased from 1st sampling to picking. The lowest content of fructose was found for non-irrigated defoliation at 1st sampling (15.56 mg/g), where it increased to 36.03 mg/g at picking. Non-irrigated control had 15.92 mg/g of fructose at 1st sampling and 44.63 mg/g at picking. Sucrose was not detected at 1st and 2nd sampling. On 17th August 3.94 mg/g of sucrose was found in non-irrigated defoliation and 4.45 mg/g in non-irrigated control. At picking sorbitol content in non - irrigated defoliation (11.86 mg/g) was much lower as in non-irrigated control (16.05 mg/g) and foliar fertilization (17.54 mg/g). The sorbitol content increased from 1st June to 17th August. | |
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