AP1 — Oryza sativa Japonica

Summary

OsAP1 (OS10G0536100) encodes a MADS-box transcription factor containing MADS-box and K-box domains, with RNA polymerase II-specific DNA-binding and transcription corepressor activity. In rice, this gene is associated with floral organ identity and development, including specification of ovule and carpel identity, stamen formation, floral whorl morphogenesis, and meristem determinacy. It is linked to inflorescence and spikelet meristem identity, heading date, grain shape and weight, panicle architecture, tillering, and photoperiod-sensitive flowering time. Additional associations include leaf senescence, root development, seed coat development, and responses to high temperature, UV light, and hormones such as cytokinin and brassinosteroid. The protein localizes to the nucleus, cytoplasm, and nucleolus. Studies of related genes in other species link the family to floral transition, floral organ abscission, and seed yield.