FIGURE 1.

N dynamic in plants. This figure represents the addition and losses of N through soil. There are several soil reactions such as mineralization, nitrification involved in the conversion of fixed N to available form and then uptake and transport from root to shoot. Nitrate (NRT; nitrate transporter) and ammonium (AMT; ammonium transporter) are the major forms of N movement through soil to root, root to root-shoot junction, then through phloem tissue. In this process, several transporters are involved which are highlighted in the figure such as phloem loading and unloading, xylem loading and unloading. After reaching the N in the leaf tissue is used for conversion of different compound synthesis and stored in the form of amino acids and proteins.