AP1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.1HG0050060, also known as VRN1 or AP1, encodes a protein with a K-box domain that binds DNA and regulates RNA polymerase II transcription. It is associated with the regulation of the vegetative-to-reproductive phase transition, vernalization response, and floral meristem identity. The gene is linked to inflorescence and flower development, including morphogenesis of floral organs, and to fruit and seed development. Associations with agronomic traits include heading date, spike length, grain weight, photoperiod-sensitive flowering time, and leaf length. It has also been connected to responses to abiotic stresses such as high temperature and UV light, as well as to hormone sensitivities including cytokinin and brassinosteroid. Related genes in other species are linked to flower senescence and abscission, grain shape, and tiller architecture.