Figure 1.

Summary of the contribution of NO₃⁻ transporters in rice. OsNRT1.1, OsNRT1.2, OsNRT2.1, and OsNRT2.2 (cooperating with OsNAR2.1) are responsible for NO₃⁻ uptake from the soil. OsNRT2.3a cooperating with OsNAR2.1 is responsible for root-to-shoot NO₃⁻ transport, and OsNRT2.3b is also responsible for transporting NO₃⁻ to the shoot and remobilizing N into the grain. OsNPF2.2 and OsNPF2.4 are involved in NO₃⁻ translocation. OsNPF4.5 is induced by mycorrhizal, involved in symbiotic N uptake. Blue line means NO₃⁻ uptake, yellow line means transport NO₃⁻ from root to shoot, red line means NO₃⁻ translocation, orange line means NO₃⁻ redistribution.