HAP3 — Oryza sativa Indica Group

Summary

BGIOSGA000540 (HAP3, also known as OiHAP3, NF-YB8, or HAP3A) on chromosome 1 of Indica rice encodes a protein with a histone-fold domain and a CBF/NF-Y/archaeal histone domain, possessing DNA-binding transcription activator activity specific to RNA polymerase II. This gene is associated with grain quality and grain size, as well as grain width, length, weight, and yield. It has been connected to photoperiod sensitivity and flowering time, including responses to long-day and short-day conditions, and to traits such as cold tolerance, salt tolerance, disease tolerance, chlorophyll content, photosynthetic rate, starch and protein content, seed dormancy, root length, and leaf chlorosis. The gene is also linked to stomatal complex development and patterning, photomorphogenesis, the MAPK cascade, and GA signaling. Studies of related genes in other species link the family to drought tolerance and flowering time.