The grain yield and quality in wheat are determined by the physiological activities inorgans as roots, stems, leaves and grains, in relation to nitrogen absorbed from the fieldduring the growth and development in wheat. It has been an important task in wheatresearch and production how to produce more grain starch or grain protein with limitednitrogen supply. Therefore, clarifying the mechanism of high nitrogen uptake andutilization in diverse genotypes of wheat has become a key issue to be solved u...