HB2 — Beta vulgaris subsp. vulgaris

Summary

BvHB2 (BVRB_3G050180) on sugar beet chromosome 3 encodes a non-symbiotic hemoglobin class 2 protein, belonging to the leghaemoglobin and globin families, with oxygen carrier and binding activity, heme binding, redox activity, and metal binding. It is associated with oxygen transport, homologous recombination, triglyceride anabolism, fatty acid metabolism, and responses to cytokinin and abscisic acid, and localizes to the cytosol, cytoplasm, and nucleus. The gene is linked to cytoplasmic male sterility, oleic acid content, and numerous phenotypes including stomatal regulation, nitric oxide regulation, shoot organogenesis, tracheary element differentiation, flowering and bolting time, seed oil content, cold stress and hypoxia responses, nitrogen fixation, and cytokinin response. Studies of related genes in other species connect the family to traits such as nitrate and sucrose content, seed yield, drought tolerance, plant height, root morphology, and nitrogen use efficiency.