ABI5 — Medicago truncatula

Summary

MTR_2G086390, also known as MtDPBF2, ABI5, or MtBZIP67, encodes a bZIP transcription factor with DNA-binding and transcription coactivator activities, as well as protein phosphatase activity. This barrel medic gene is associated with the regulation of seed dormancy, gibberellic acid and abscisic acid signaling, nitrogen utilization, pollen maturation, and the hyperosmotic salinity response. It has been linked to numerous agronomic traits including seed set percent, seed longevity, nitrate sensitivity, plant male sterility, pollen fertility, shoot system elongation, leaf size, anthocyanin content, and stomatal complex closure time. The gene is also connected to seed fatty acid composition, particularly omega-3 fatty acid, linoleic, linolenic, oleic, and eicosenoic acid content. Studies of related genes in other species link the family to salt and cadmium stress tolerance, nitrogen metabolism, and plant size.