AP1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.4HG0396410 (HvAP1, also known as HvVRN1) on barley chromosome 4H encodes a MADS-box transcription factor containing a MEF2-like N-terminal domain. The protein localises to the nucleus, cytosol and nucleolus and exhibits sequence-specific DNA binding, transcription factor and protein dimerisation activities. HvAP1 is associated with the regulation of developmental processes, including maintenance of inflorescence and floral meristem identity, carpel and integument development, fruit morphogenesis, and floral organ senescence. It is linked to traits such as photoperiod-sensitive flowering time, spike length, leaf length, stem elongation, grain weight, heading date, and responses to high temperature stress and UV light. Related genes in other species link the family to petal, sepal and inflorescence development, tillering, panicle architecture and grain shape.