IAA4 — Pisum sativum

Summary

PSAT3G016840 (IAA4) on garden pea chromosome 3LG5 encodes an AUX/IAA family protein containing the AUX_IAA domain and a PB1-like domain. The protein localises to the nucleus and is associated with auxin signalling, including the TIR1-IAA-AUX/IAA interaction and ARF inactivation pathways. IAA4 is associated with geotropism, photomorphogenesis, root development, and the regulation of DNA-templated transcription. It is also associated with seed development, reproductive structure development, and the regulation of seed size, as well as broader growth and developmental processes. Additional associations include protein synthesis, mRNA stabilisation, and the response to auxin. Studies of related AUX/IAA proteins in other species link the family to auxin-induced responses, though these functions are not yet established for pea IAA4 itself.