HAP4 — Oryza sativa Indica Group

Summary

BGIOSGA027531 (HAP4) on Indica rice chromosome 8 encodes a ubiquitin-domain protein with histone methylase, deubiquitinase, ubiquitin-binding, and ribosome structural constituent activities, and is annotated as a transcription cis-regulatory region binding protein. This gene is associated with seed morphogenesis, dormancy, and endosperm development, as well as stomatal lineage progression, trichome branching, and shoot development. It is linked to regulation of abscisic acid anabolism and salinity response, and to responses to freezing and thermal stimuli. Traits associated with HAP4 include grain weight and yield, seed growth, leaf length and senescence, root morphology and mass density, flowering time, pollen fertility, and temperature stress responses. The gene also shows connections to chloroplast development, disease tolerance, and metabolite content. Studies of related genes in other species link the family to seed size, salt and drought tolerance, and cell proliferation.