以不具肉质根的普通白菜‘华冠’为对照,对三个薹菜品种肉质根发育过程中糖分积累及糖代谢相关酶活性进行了研究。结果显示,与普通白菜相比,薹菜肉质根直径、干重及根冠比在整个生育期呈上升趋势,薹菜与普通白菜库活性则均下降。生长后期,三个薹菜品种根部可溶性总糖、还原糖及蔗糖含量均高于对照,而叶片中的可溶性总糖和还原糖含量则显著低于对照。薹菜和普通白菜叶片及根部的酸性转化酶(acid invertase,AI)和中性转化酶(neutral invertase,NI)活性在整个生育期的变化规律基本一致。播种32~39 d后,薹菜肉质根的蔗糖合成酶(sucrose synthase,SS)及蔗糖磷酸合成酶(sucrose phosphate synthase,SPS)活性均大幅上升,同时伴随蔗糖含量的显著积累。而‘华冠’白菜根部两种酶活性及蔗糖含量在整个生育期中变化平缓。三个薹菜品种肉质根直径、干重及根冠比与SPS活性的相关性达到显著水平,‘平度薹菜’根部发育指标与SS活性也呈正相关,推测蔗糖磷酸合成酶调控薹菜肉质根中蔗糖的积累水平;而转化酶在肉质根生长初期起到提供碳源的重要作用。 The common cabbage ’Arima’ with no fleshy roots was taken as the control to study the sugar accumulation and the activities of enzymes related to glucose metabolism during the development of succulent roots of three sedge cultivars. The results showed that compared with common Chinese cabbage, the diameter, dry weight and root / shoot ratio of flesh in scallop showed an upward trend during the whole growing period, while the activity of sedge and common cabbage decreased. The content of total soluble sugar, reducing sugar and sucrose in the root of three sessile cultivars were higher than that of the control in late growth period, while the contents of soluble total sugar and reducing sugar in leaves were significantly lower than those of the control. The changes of acid invertase (AI) and neutral invertase (NI) activity in leaves and roots of Sai Choi and common cabbage were basically the same during the whole growth period. After sowing for 32-39 days, sucrose synthase (SS) and sucrose phosphate synthase (SPS) activities in succulent roots of Saikon cabbage increased significantly, accompanied by the significant accumulation of sucrose content. However, the activities of two enzymes and sucrose content in root of ’Arima’ cabbage changed gently throughout the growth period. The correlations between root diameter, dry weight, root / shoot ratio and SPS activity of three sedge varieties reached a significant level. The root development index of ’Pingdu Sai Cai’ was also positively correlated with SS activity, and it was speculated that sucrose phosphate synthase regulated the sucrose content Root sucrose accumulation level; and invertase play an important role in providing carbon source in the early fleshy root growth.