HB1 — Medicago truncatula

Summary

MTR_4G068860 (MtHB1) encodes a globin-domain protein with leghaemoglobin-like features, annotated with oxygen carrier, heme binding, redox activity, and DNA binding functions. It is associated with nitric oxide metabolism, responses to hypoxia, flooding, nitrate, ammonia, sucrose, cytokinin, salt, and stress, as well as nitrogen fixation, regeneration, arbuscular mycorrhizae formation, and response to symbiotic bacteria and fungi. The gene product localises to the nucleus, cytosol, cytoplasm, plasmalemma, plasmodesma, nuclear matrix, and plant-type cell wall. MtHB1 is linked to photosynthetic rate, oxygen binding, hypoxic stress response, flowering time, root architecture, somatic embryogenesis, drought tolerance, anthocyanin synthesis, cold stress response, and rhizosphere microbiome composition. Studies of related genes in other species connect the family to waterlogging tolerance, hypoxia tolerance, nitrogen use efficiency, seed yield, and fungal resistance.