用含有１４Ｃ标记的外源糖（葡萄糖和蔗糖）的示踪试验表明，外源糖引入２ｄ即可运转到植株各个部位，果实、幼嫩茎、叶等库性器官的持有量占较大比例；黄瓜对外源葡萄糖的吸收量显著多于蔗糖；根系对外源葡萄糖的外泌现象重于蔗糖，从而对根系不同外源糖的持有量产生极显著的影响 Tracing experiments with 14C-labeled exogenous sugars (glucose and sucrose) showed that the exogenous sugar can be transported to all parts of the plant for 2 days and the proportion of fruit, young stems, leaves and other salient organs accounts for a large proportion ; Cucumber’s absorption of exogenous glucose was significantly more than that of sucrose; exogenous glucose exogenous glucose excretion was heavier than that of sucrose, which had a very significant effect on the amount of exogenous sugar in roots