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本实验研究了四个不同类型品种的甜菜在生育前期叶片和叶柄中的蔗糖合成酶和蔗糖磷酸合成酶酶活性的变化特点及其与蔗糖含量的关系,并探讨了对生长发育和块根含糖率的影响。叶柄中蔗糖合成酶活性在不同类型品种间存在着差异。表现为丰产型品种大于高糖型品种,通过成对样本差异显著性测定达到了极显著程度(3.39867≤T≤5.06725P_(0.01)=3.25)。另外,14—18叶期叶柄中的蔗糖合成酶活性与收获期块根含糖率呈极显著负相关γ=—0.4847(α=0.005)。据此,甜菜生育前期叶柄中的蔗糖合成酶活性可作为选育或鉴定高糖型品种的参考指标。根据叶柄中蔗糖磷酸合成酶活性大于叶片,且蔗糖含量也是叶柄显著高于叶片的事实,甜菜叶柄中存在着蔗糖合成的过程。
In this study, the changes of sucrose synthase and sucrose phosphate synthase activities in four different types of sugarbeet leaves and petioles at early growth stage and their relationship with sucrose content were investigated. The effects of growth and development, Rate of impact. Petiole sucrose synthase activity in different types of varieties exist differences. The results showed that the high-yielding varieties were higher than the high-sugar-producing varieties, and the significant difference was significant (3.39867≤T≤5.06725P_ (0.01) = 3.25). In addition, sucrose synthase activity in petiole at 14-18 leaf stage was significantly negatively correlated with sugary rate at harvest (γ = -0.4847, α = 0.005). Accordingly, sucrose synthase activity in petiole at the early growth stage of beet may serve as a reference index for breeding or identifying high-sugar type cultivars. According to the fact that the activity of sucrose phosphate synthase in petioles is greater than that of leaves, and sucrose content is also significantly higher in petiole than in leaves, sucrose synthesis exists in petiole of sugar beet.