Effects of Different Types of Nitrogen Fertilizer on Leaves N-Metabolism and Grain Protein of Wheat Cultivars with Specialized End-Uses

In a pot experiment, effects of three different types of nitrogen fertilizer on leaves N-metabolism and grainprotein as well as components of wheat cultivars with specialized end-uses were studied. The results showed that with NH2--N treatment(urea) , strong gluten wheat Yumai34 had higher activity of NR in leaves at blossom, higher N contents and thehighest protein content of grain, and albumin content and the value of glutenins/gliadins, processing quality and nutritionalquality were improved significantly. The grain protein content , albumin content and the value of glutenins/gliadins ofmedium gluten wheat-Yumai49 were the highest with NH+4-N treatment, processing quality and nutritional quality were alsoimproved significantly. The grain protein content, albumin content and the value of glutenins/gliadins of weak gluten wheatYumai50 were lowest with NH+4-N treatment, with good processing quality. Grain protein content was closely related to Ncontent of leaves at flowering stage, but not to NR activity.