柑橘果实发育成熟中果肉游离糖、肌肌醇及钾含量的变化

以龟井（无籽）温州蜜柑和鄂柑1号（有籽）橘为试材，对果实发育成熟过程中果肉游离糖（果糖、葡萄糖和蔗糖）、肌肌醇及钾含量变化进行了测定。结果表明：(1)果实增大初期鄂柑1号果肉果糖和葡萄糖含量明显上升，蔗糖变化小，肌肌醇却趋下降，进入果实增大中后期，蔗糖含量显著上升，其它变化小；而龟井的果糖、葡萄糖和蔗糖均于果实增大初期和中期出现明显积累，肌肌醇除在增大中期出现一峰值外趋于平稳；采前果实发育期两品种总糖含量变化趋势均与各自的蔗糖较一致；(2)采后贮藏期内两品种果肉总糖和肌肌醇含量均趋于稳定，而二者的果糖、葡萄糖和蔗糖含量变化趋势却均趋相反；(3)两品种果肉钾含量均在果实增大期内出现明显上升并居相对较高水平。

Changes in Concentrations of Free Sugars, Myo-inositol and Potassium in the Pulp During Citrus Fruit Development and Maturation

Changes in concentrations of free sugars(fructose, glucose and sucrose), myo-inositol and potassium (K) in the pulp during fruit development and maturation of citrus i.e. Kamei(seedless) Satsuma mandarin(Citrus unshiu Marc.) and Egan 1 (seedy) tangerine(Citrus reticulata Blanco)were investigated. The results showed as follows: (1)During the early phase of fruit enlargement, concentrations of fructose and glucose of Egan 1 obviously increased, that of sucrose showed little change, while myo-inositol concentration progressively decreased, during the middle and later phase of enlargement, sucrose concentration significantly increased, others changed slightly. Concentrations of fructose, glucose and sucrose of Kamei all markedly accumulated during the early and middle phase of fruit enlargement, myo-inositol concentrations were relatively stable except that the relatively small peak presented during the middle phase of enlargement. Changing trends of total sugars were almost accordant with those of sucrose in the pulp of two cultivars during fruit development. (2) During fruit storage, myo-inositol and total sugars of two citrus cultivars remained relatively constant, whereas concentrations of fructose, glucose and sucrose between two cultivars were all in the reversed trends.(3) K concentrations in the pulp of two cultivars significantly increased and remained relatively high levels during the stage of fruit enlargement.