Soil salinization has been a main barrier in protected vegetable production and seriously hampered the sustainability of production.Cucumber(Cucumis sativus L.)is widely planted in field and facilities,but soil secondary salinization has restricted cucumber production.The main stress anion is nitrate.Plants assimilate nitrogen element through nitrate assimilation pathways in the form of NO_3~-and NH4+.The assimilation of nitrate is a tightly regulated process in which NR and NiR play a major regulatory role...