Effect of Nitrogen Application Levels on Nitrogen Assimilation and Grain Protein Components Accumulation in Strong Gluten Wheat

Effect of nitrogen application levels on nitrogen assimilation and grain protein components accumulation in strong gluten wheat was studied on the condition of high-yield.Results showed that with nitrogen supply increasing from 0 to 195 kg/hm2,nitrate reductase(NR) and glutamine synthetase(GS) activities in flag leaf were enhanced,the content of nitrogen and the amount of nitrogen accumulated in every organs increased,the content of monomeric protein,soluble glutenin and insoluble glutenin increased,the content of total protein and the ratios of soluble glutenin and insoluble glutenin to total protein increased,grain quality was improved.With excessive nitrogen supplied,NR and GS activity in flag leaf and total protein content in grain were not affected significantly,but the ratios of soluble and insoluble glutenin to total protein,and grain quality decreased.Nitrogen supplied from 105 kg/hm2 to 195 kg/hm2 can realize high yield and high quality simultaneously.