HB1 — Beta vulgaris subsp. vulgaris

Summary

BvHB1 (BVRB_9G218080) on sugar beet chromosome 9 encodes a non-symbiotic class 1 hemoglobin with oxygen carrier activity, heme binding, redox activity, and TBP-class protein binding. It is associated with responses to hypoxia, flooding, nitric oxide, cold, abscisic acid, ethylene, cytokinin, and sucrose, as well as nodulation, arbuscular mycorrhizae formation, and DNA-templated transcription initiation. The protein localizes to the nucleus, cytosol, plasmodesma, and cell wall. This gene has been linked to salt tolerance, drought tolerance, flowering time, root architecture, nitrogen metabolism, nitric oxide homeostasis and scavenging, hypoxic stress response, anthocyanin synthesis, and somatic embryogenesis. Studies of related genes in other species connect the family to waterlogging tolerance, seed yield, nitrogen use efficiency, pathogen resistance, and submergence tolerance.