HO1 — Oryza sativa Indica Group

Summary

BGIOSGA020927 (symbol HO1, also known as OiHY6, SE5, HY1 and GUN2) on indica rice chromosome 6 encodes a heme oxygenase (decyclizing) enzyme (EC 1.14.14.18) that belongs to the haem oxygenase-like family. The product localises to the chloroplast thylakoid membrane and envelope. In this species, HO1 is associated with floral development, heading date and salt stress tolerance. The gene is linked to heme oxidation, phytochromobilin biosynthesis, photoperiodism, red/far-red light phototransduction, chloroplast-nucleus signalling, flavonoid and glutathione metabolism, regulation of stomatal movement, meristem size and inflorescence development. It has also been connected to cadmium concentration, pollen fertility, chlorophyll content, oxidative stress response, photomorphogenesis, flowering time, chloroplast development, lateral root formation, boron tolerance and glucose response. Studies of related genes in other species link the family to phytochrome chromophore synthesis, iron homeostasis and seed germination.