AP1 — Triticum turgidum subsp. durum

Summary

TRITD4BV1G194510 (symbol AP1, also known as TtAP1) on durum wheat chromosome 4B encodes a MADS-box transcription factor containing MEF2-like and K-box domains. It binds DNA and RNA polymerase II regulatory regions, acts as a transcription corepressor, and mediates protein homo- and heterodimerization. The gene is associated with specification of floral organ identity (ovule, stamen, carpel), inflorescence and floral meristem maintenance, fruit and seed morphogenesis, and integument development. It is linked to flowering time under photoperiodic and drought conditions, as well as to traits including days to flowering, heading date, grain weight, seed growth, inflorescence architecture, and responses to UV-B, high temperature, and drought. Related genes in other species link the family to petal, sepal, and inflorescence development, grain shape, tillering, and reproductive transition.