HB1 — Medicago truncatula

Summary

MTR_4G068870 (MtHB1, also known as MtGLB1) encodes a leghaemoglobin-like protein with oxygen carrier activity, heme binding, and redox activity, and is annotated to TBP-class protein binding and DNA binding. It is associated with nitrogen fixation, nitric oxide metabolism, responses to hypoxia, flooding, nitrate, ammonia, sucrose, cytokinin, salt, and stress, as well as arbuscular mycorrhizae formation and regeneration. The gene is linked to photosynthetic rate, flowering time, root architecture, drought tolerance, somatic embryogenesis, shoot organogenesis, anthocyanin synthesis, and rhizosphere microbiome composition. It localises to the nucleus, cytosol, plasmalemma, cell wall, and plasmodesmata. Studies of related genes in other species connect the family to waterlogging tolerance, hypoxia tolerance, nitrogen use efficiency, seed yield, and fungal resistance.