MSG2 — Arabidopsis thaliana

Summary

AT3G15540 (MSG2, also known as IAA19) in Arabidopsis thaliana encodes an AUX/IAA family protein with auxin receptor activity, auxin binding, transcription corepressor activity, and DNA-binding transcription factor activity. This nuclear-localized protein is associated with auxin signaling pathways, including ARF inactivation and strigolactone, jasmonic acid, and brassinosteroid signaling. The gene is linked to numerous developmental and agronomic traits, including tropism, thermomorphogenesis, transdifferentiation, inflorescence phyllotactic patterning, secondary growth, and tracheary element differentiation. It has been connected to traits such as phototropism response, root branching, leaf morphology, silique fruit morphology, plant male sterility, water stress response, and nitrate sensitivity. Studies of related genes in other species link the family to plant height, fruit length, water use efficiency, and heterosis.