HB-3 — Medicago truncatula

Summary

MTR_2G015000 (MtHB-3, also known as MtWOX9A, MtSTIP, and MtWOX9B) on barrel medic chromosome 2 encodes a homeodomain-containing transcription factor of the WOX8/9-like family with DNA binding, transcription coactivator activity, and protein binding functions. The gene is associated with regulation of developmental processes including cotyledon boundary formation, leaf abscission, regeneration, adventitious root development, meristem size regulation, gibberellic acid homeostasis, seed dormancy, and nitrogen utilization. It has been linked to numerous agronomic traits such as seed set, shoot elongation, whole plant size, male sterility, pollen fertility, flowering time, drought tolerance, anthocyanin content, leaf senescence, and root thickness. The product localizes to both cytoplasm and nucleus. Related genes in other species connect the family to embryonic patterning, zygote polarity, meristem maintenance, and shoot regeneration.