AP1 — Arabidopsis thaliana

Summary

AT1G69120 (AP1, also known as APETALA1 and AGL7) on chromosome 1 of Arabidopsis thaliana encodes a MADS-box transcription factor. The protein possesses DNA-binding transcription factor activity, RNA polymerase II-specific, along with transcription coactivator and corepressor activities, and binds chromatin and histones. AP1 is associated with floral meristem determination, sepal and petal identity, and petal number robustness. It is linked to corolla development, bract morphogenesis, floral whorl development, and regulation of double fertilization. The gene has been connected to numerous traits including fruit yield, harvest index, seed volume, seed color, flower morphology, inflorescence branching, leaf area index, stem thickness, stamen number, carpel shape, and boron and potassium sensitivity. AP1 localizes to the nucleus, cytoplasm, cytosol, plastid, vacuolar membrane, and plasmodesmata, and is associated with auxin signalling, regulation of seed size, and crown root development.