AFB1 — Triticum turgidum subsp. durum

Summary

TRITD6AV1G192960 (AFB1) on durum wheat chromosome 6A encodes a protein with auxin receptor activity, auxin binding, NEDD8 transferase activity, and multiple transporter activities including auxin influx and efflux, ABC-type indole, and cadmium ion transmembrane transport. The protein contains an F-box domain and leucine-rich repeats characteristic of the COI1/TIR1 family. In durum wheat, AFB1 is associated with leaf rust resistance. The gene is linked to auxin signalling, ubiquitination and degradation of AUX/IAA proteins, and regulation of seed size, reproductive structure development, and growth processes. It localises to the nuclear SCF complex and is associated with diverse processes including response to nitrate, defense response by callose deposition, lateral root development, planar polarity establishment, and aflatoxin anabolism. Associations with seedling cotyledon size, biomass yield, seed yield, herbicide sensitivity, phototropism, and temperature stress response have also been noted.