GA5 — Oryza sativa Japonica

Summary

OsGA5 (Os07g0169700) encodes a gibberellin 20-oxidase, a 2-oxoglutarate-dependent dioxygenase that also exhibits flavanone 3-dioxygenase activity and binds vitamin C and metal ions. In rice, this gene is associated with gibberellin biosynthesis and homeostasis, plant stature, seed dormancy, grain chalkiness, yield, and bacterial blight disease development. It has been linked to numerous agronomic traits including panicle length, grain size and thickness, tiller number, flag leaf angle, seedling vigour, days to heading, salinity tolerance, and aluminium tolerance. The encoded protein localises to the cytoplasm and nucleus and is connected to processes such as anther development, stomatal closure, and responses to flooding and red/far-red light. Studies of related genes in other species link the family to stem growth, internode elongation, flowering time, and gibberellin feedback regulation.