AP1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.1HG0054220 (symbol AP1, also known as HvVRN1 and HvGOA) on barley chromosome 1H encodes a MADS-box transcription factor containing a MEF2-like N-terminal domain. The protein localises to the nucleus and cytosol and exhibits sequence-specific DNA binding, transcription corepressor activity, and protein dimerisation activity. HvAP1 is associated with the specification of ovule, stamen, and floral meristem identity, inflorescence morphogenesis, fruit development, and the regulation of auxin polar transport and root meristem size. The gene is linked to photoperiod-sensitive flowering time, days to flowering, spike length, grain weight, heading date, leaf length, stem elongation, and responses to high temperature, UV light, and drought. Related genes in other species are linked to petal, sepal, and inflorescence development, grain shape, tillering, and reproductive transition.