ATR2 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.1HG0053170 (HvATR2) on barley chromosome 1H encodes a bHLH transcription factor of the AIB/MYC-like family, with annotated activities including transcription coactivator and corepressor activity, histone binding, and SUMO transferase activity. The gene is associated with regulation of glucosinolate biosynthesis, cellular response to sulfur starvation, drought recovery, and defense response to insects. It has been linked to aleurone colour, seed maturation, and trichome spacing. Associations with agronomic traits include seed protein content, stem length, whole plant size, and responses to temperature stress, phosphorus, and potassium. Studies of related genes in other species link the family to jasmonate signalling, drought tolerance, seed oil accumulation, and defence against pathogens including Fusarium oxysporum.