Nitrogen use efficiency (NUE) for the crop plants is of great concerns throughout the world. The burgeoning population of the world needs crop genotypes responding to higher nitrogen and showing a direct relationship to yield with the use of nitrogen inputs . high nitrogen-responsive genotypes. However, for fulfilling the high global demand of organic produce, it requires the development of low nitrogen-responsive genotypes with greater nitrogen use efficiency and grain yields. Nitrogen is the most important inorganic nutrient for plant growth. | Concurrent expression and regulation of genes involved in carbon and nitrogen metabolism in relation with nitrogen use efficiency