HB1 — Medicago truncatula

Summary

MTR_0026S0210 (MtHB1) encodes a leghaemoglobin-like protein with oxygen carrier activity, heme binding, and redox activity, and is also annotated for TBP-class protein binding and DNA binding. In barrel medic, MtHB1 is associated with nitrogen fixation, nitric oxide metabolism and response, response to hypoxia and flooding, response to nitrate, ammonia, and sucrose, response to symbiotic bacteria and fungi, arbuscular mycorrhizae formation, regeneration, and stress responses. It localises to the nucleus, cytosol, plasmalemma, plasmodesma, and plant-type cell wall. Associations include photosynthetic rate, oxygen binding, hypoxic stress response, flowering time, root architecture, somatic embryogenesis, nitric oxide scavenging and homeostasis, drought tolerance, nitrogen metabolism, anthocyanin synthesis, and cold stress response. Studies of related genes in other species link the family to waterlogging tolerance, hypoxia tolerance, nitrogen use efficiency, seed yield, and fungal resistance.