NIR — Cucumis sativus

Summary

CsNIR (CSA_3G207890) on cucumber chromosome 3 encodes a ferredoxin-nitrite reductase with NO-forming nitrite reductase activity, sulfite reductase (ferredoxin) activity, and 4Fe-4S cluster and heme binding, placing it in the NIR_SIR_4Fe-4S family. The gene is associated with nitrate assimilation, response to nitrate, sulfate assimilation, electron transport, and TCA cycle processes, and its product localises to the chloroplast stroma and nucleoid, mitochondria, and apoplast. CsNIR is linked to traits including nitrate content and uptake, nitrogen and carbon content, photosynthetic rate, respiration rate, plant height, stem and flower diameter, root and shoot dry weight, soluble protein and sugar content, anthocyanin content, iron concentration, and salt tolerance. It is also connected to nitrate-responsive gene expression and plant growth phenotypes. Studies of related genes in other species link the family to leaf nitrogen and chlorophyll content, drought tolerance, disease susceptibility, and acid rain resistance.