HB1 — Solanum tuberosum

Summary

StHB1 (PGSC0003DMG400030927) on potato chromosome 7 encodes a hemoglobin protein belonging to the leghaemoglobin and globin families. The encoded product exhibits oxygen carrier activity, heme binding, redox activity, and TBP-class protein binding. StHB1 is associated with responses to hypoxia, flooding, nitric oxide, nitrate, nitrite, sucrose, and cytokinin, as well as with electron transfer, nitric oxide anabolism, and arbuscular mycorrhizae formation. It localizes to the nucleus, cytosol, plasmalemma, and plasmodesmata. The gene is linked to traits including grain moisture content, carotenoid content, and response to pH, and to phenotypes such as salt tolerance, drought tolerance, flowering time, root architecture, and somatic embryogenesis. Studies of related genes in other species connect the family to hypoxia tolerance, waterlogging tolerance, and seed yield.