Effect of Nitrogen Application on the Content of Soluble Sugar and Key Enzyme Activities in Sugar Metabolism of Sugar Beet
In order to select suitable level of nitrogen and study the relationships between nitrogen nutrition and the sucrose metabolism of sugar beet,urea was used as soil nitrogen fertilizer and HI003 was selected as experimental sample,the effects of different nitrogen levels on the content of soluble sugar,activities of sucrose phosphorus synthase and sucrose synthase were studied in roots and leaves.The results were as following:in the early growth stage,the content of soluble sugar decreased with the increase of nitrogen levels in both roots and leaves.Nitrogen (40-160 kg/hm2) increased the content of soluble sugar in roots in the tuber sugar accumulation period,and decreased the content of soluble sugar with the increase of nitrogen levels more than 160 kg/hm2.Nitrogen application increased activities of sucrose phosphorus synthase in sugar beet leaves in the whole growth period,and decreased activities of sucrose synthase with the increase of nitrogen levels in sugar beet leaves in the early growth stage.In sugar beet roots,activities of sucrose phosphorus synthase and sucrose synthase decreased with nitrogen application in the early growth stage,but suitable nitrogen levels (120-160 kg/hm2) increased activities of sucrose phosphorus synthase and sucrose synthase in later growth stage.The results showed that high nitrogen levels were not beneficial to sugar accumulation and the suitable levels of nitrogen were 120-160 kg/hm2.
NETL
NSTL
万方数据
维普
