HAP3 — Oryza sativa Japonica

Summary

OS01G0834400, designated HAP3A (also known as NF-YB1, NF-YB8, NF-YB10, OsHAP3, and OsNF-YB1), encodes a transcription factor of the NF-YB/HAP3 family on rice chromosome 1. The product contains a histone-fold domain and is annotated as a DNA-binding transcription activator and transcriptional co-regulator, with protein heterodimerization and sequence-specific DNA binding activities. In rice, HAP3A is associated with grain quality, endosperm cellularization, phloem loading, sucrose transport, stomatal complex patterning, photomorphogenesis, and regulation of long-day flowering. It is also linked to numerous agronomic traits including grain plumpness, grain yield, grain length and width, amylose and starch content, panicle number, tiller angle, awn length, seed shattering, photoperiod sensitivity, and days to heading. The protein localizes to the nucleus, nucleolus, plastid, and cytosol.