Saeid Navabpour - Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I. R. Iran
Hourieh Najafi - Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I. R. Iran
Fatemeh Sahraei-Qomesh - Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I. R. Iran

In crop production, one particularly limiting factor is the availability of nitrogen (N) and N derivatives, as they are of much significance in plant metabolism and growth. Various nitrate transporter genes mediate the uptake, transport, and remobilization of N in the plants. However, their role is not quite understood with respect to grain filling stages and plant’s overall yield. Herein, the expression of a number of genes and enzymes with roles in N uptake and metabolism was measured over the course of anthesis and under N-treatment and N-deficit condition in two wheat genotypes, namely Morvarid and Gonbad. The samples were taken ۱۰, ۱۵, and ۲۰ days after anthesis, which is a critical stage in grain filling, and the relation between gene expression, enzyme activity, and days after anthesis was demonstrated. It was observed that N-related gene expression significantly increases under N-deficit condition and over the course of anthesis, suggesting the significance of the N-related genes and enzyme in maintaining the metabolism and growth of the plants under N-deficit conditions.

Nitrogen, Gene expression, Root, Wheat