Dynamic Changes of Grain Sugar,Starch,Protein Contents during Grain Filling Stage in Waxy Wheat

A field experiment was conducted to study the dynamic changes of grain sugar,starch,protein content in waxy wheat(Nuomai 12 and Nuomai1572) and the differences of dynamic changes between waxy and common wheat during filling stage.The results showed that the highest protein content and grain starch accumulating rate in waxy wheat were observed during 17~22 days after anthesis.The highest pentosan content in waxy wheat was appeared during 22~27 days after anthesis,while the highest fructan content was appeared during 7~12 days after anthesis.During the filling stage,the contents of grain total sugar,sucrose,starch,fructan and grain starch accumulating rate showed different dynamic changes between waxy and common wheat,but protein content showed similar dynamic changes in waxy and common wheat.Comparing with common wheat varieties,waxy wheat grain soluble sugar content was higher,and the sucrose content of waxy wheat line Nuomai12 was significantly greater than three common varieties.In terms of grain pentosan content,two waxy wheat varieties were significantly greater than Chuanyu20 and Chuanyu12.The starch content of waxy wheat line Nuomai 1572 was significantly lower than three check common varieties.There was no significantly difference between waxy wheat and common varieties in terms of grain protein and fructan content.According to the different dynamic changes between waxy and common wheat,the above results indicated that the quality of waxy wheat can be improved by optimum cultivation measures.