HO1 — Sorghum bicolor

Summary

SORBI_3010G184600 (SbHO1) on sorghum chromosome 10 encodes a heme oxygenase (decyclizing) with EC 1.14.14.18 activity, belonging to the Haem_Oase_decyc_pln family. The enzyme localises to the chloroplast thylakoid membrane and envelope, and is associated with heme oxidation and phytochromobilin anabolism. SbHO1 is associated with photoperiodism, flowering, de-etiolation, red/far-red light phototransduction, chloroplast-nucleus signalling, regulation of stomatal movement, inflorescence development, flavonoid anabolism, response to nitrate, and regulation of meristem size. The gene has been connected to oxidative stress response, protein content, root length, and anthesis time. Studies of related genes in other species link the family to phytochrome chromophore synthesis, iron homeostasis, salt stress tolerance, and chloroplast development, as well as heading date and floral traits.