XA5 — Oryza sativa Indica Group

Summary

BGIOSGA019022 (XA5, OiXA5) on chromosome 5 of indica rice encodes a transcription initiation factor IIA gamma subunit (TFIIAγ) with general transcription factor (GTF2) activity, TBP-class protein binding, and translation initiation factor activity. It is a component of the transcription factor TFIIA complex localized to the nucleus and is associated with RNA polymerase II transcription preinitiation complex formation and transcription initiation from Pol II promoters. XA5 is associated with defense response and is linked to bacterial blight resistance, disease resistance, and pathogen response phenotypes in rice. The gene is also associated with root morphology traits. Studies of related genes in other species link the TFIIAγ family to grain number, grain weight, grain yield, plant height, panicle number, tiller number, and quality traits, as well as arsenic concentration.