AP1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.6HG0540820 (HvAP1, also known as HvVRN1) on barley chromosome 6H encodes a MADS-box transcription factor with RNA polymerase II-specific DNA-binding and transcription corepressor activities. It is associated with the regulation of the vegetative-to-reproductive phase transition, inflorescence and floral meristem identity maintenance, fruit and carpel development, and floral organ senescence. The gene has been connected to numerous agronomic traits including photoperiod-sensitive flowering time, heading date, spike length, grain weight, leaf length, stem elongation, and responses to high temperature, UV light, and abiotic stress. It is also linked to vernalization response, inflorescence architecture, root development, and drought tolerance. Studies of related genes in other species associate the family with flower senescence, abscission, grain shape, tillering, and reproductive transition.