HB-3 — Medicago truncatula

Summary

MTR_4G088070 (HB-3, also known as MtWOX9A, MtSTIP, and MtWOX9B) on barrel medic chromosome 4 encodes a homeodomain-containing transcription factor of the WOX8/9-like family with DNA binding and transcription coactivator activity. The gene is associated with cotyledon boundary formation, procambium histogenesis, floral organ development, leaf abscission, adventitious root development, regulation of meristem size, gibberellic acid homeostasis, salicylic acid-mediated signaling, nitrogen utilization regulation, and seed dormancy. Associations with traits include seed set, shoot system elongation, whole plant size, male sterility, pollen fertility, drought tolerance, anthocyanin content, flowering time, and vegetative growth. The protein localizes to both the nucleus and cytoplasm. Related genes in other species link the family to embryonic patterning, zygote polarity, and basal cell fate determination.