甜菜蔗糖代谢两种相关酶的活性变化及其相互关系

为了研究不同类型甜菜品种蔗糖代谢能力存在明显差异的生理机制,以糖用甜菜(高糖)和饲用甜菜(丰产)为试验对象,测定了不同生育阶段叶片、叶柄和块根中的蔗糖合成酶(SS)和蔗糖磷酸合成酶(SPS)活性。结果表明:叶片、叶柄和块根中存在蔗糖合成与降解过程,不同类型甜菜在生长期蔗糖合成酶和蔗糖磷酸合成酶活性存在差别,同一品种不同部位,块根中蔗糖的代谢强度高于叶片和叶柄,糖用甜菜两种酶活性高于饲用甜菜,蔗糖代谢相关酶活性差异是品种特性,可用于甜菜的选种实践。

Activity Changes and Relationship to Each Other of the Sucrose-Metabolizing Enzymes in Sugar Beet Varieties (Beta vulgaris L. )

To study the physiological mechanism of sugar metabolism between two sugar beet genotypes(high sucrose and high yield),the character of changes in activity of sucrose-metabolizing enzymes(sucrose synthase and sucrose phosphate synthase) and their relationship to each other in developing various stages(leaves,stalks and taproots) were measured.It was observed that the process of sucrose metabolism exist in leaves stalks and taproots,the activity of sucrose synthase and sucrose phosphate synthase were different in growth period of two type sugar beet varieties,and in different part to the same varieties,according to enzymes activity change,sucrose-metabolizing intensity in taproots must be higher than those in leaves and stalks,sucrose-metabolizing enzymes activity in high sucrose sugar beet were higher than those in high yield ones,the enzymes activity difference among different type sugar beet belongs to inherent traits which could be used as a reference index in selecting sugar beet varieties.