不同施氮条件下甜菜RuBP羧化酶活性与产质量关系的研究

对不同施氮条件下甜菜ＲｕＢＰ羧化酶活性进行了研究，结果表明：各施氮处理ＲｕＢＰ羧化酶活性都是苗期最低，随生育进程逐渐升高，到糖分积累期又呈羧化酶活性高峰出现时间不同，Ｎ１８０处理在块根增长期，其它处理均在叶丛形成期；苗期施氮量与ＲｕＢＰ羧化酶活性呈显著正相关，其它各处理相关不显著。

Research on the relationship between the activity of RuBPase and yield and quality of sugarbeet under different nitrogen levels applied

RuBPase activity of sugarbeet was studied under different nitrogen levels applied were conducted with the results indicating as fallows: The RuBPase activity was lowest in seedling stage under all nitrogen levels applied, and rised gradually along with the progress of growth, then assumed a declining trend in sugar accumulation period, but the activity peaks appeared in different stages, which were in root rapid growth stage under N 180kg/ha, and the rest were in foliage growth stage.There were significent correlation between the RuBPase activity and nitrogen levels applied in the seedling stage, but not so to the rest stages. The RuBPase has a very closely relation to root yield and quality, and were positively correlated to the root yield in all time, but negatively correlated to the sugar content and positively related to sugar yield in general. but the degree of these correlationships were different in different time. The RuBPase activity were significently positively correlated to the root yield in root growth stage, and were significently negatively correlated to the sugar content in seedling stage,whereas has a relatively high correlative coefficient with sugar yield. Viewed from the changes of RuBPase activity and the yield and qualitity,the best result could be gained under N 120kg/ha.