IAA20 — Zea mays

Summary

ZmIAA20 (IAA20) on maize chromosome 6 encodes an AUX/IAA family protein containing an AUX_IAA domain and a PB1-like domain, localising to the nucleus. This gene is associated with auxin signalling, including TIR1-IAA-AUX/IAA interactions, ARF inactivation, and auxin transport, as well as hormone metabolism, carotenoid metabolism, nitrogen fixation, organogenesis, cell wall biogenesis, and fruit development. It has been linked to numerous agronomic traits, including grain yield per plant, grain number, grain weight, seed width, ear length, tassel branch number, plant height, leaf angle, tiller number, shoot dry weight, drought tolerance, and aluminum tolerance. Related genes in other species are associated with auxin content, seed size, panicle length, tiller angle, and cold tolerance.