PIN1 — Brassica juncea

Summary

BjPIN1 (BJUA07G33390S) on chromosome A07 of Indian mustard encodes a PIN-like auxin efflux carrier, possessing auxin efflux transmembrane transporter activity, inositol-1,4-bisphosphate 1-phosphatase activity, and binding affinities for various phosphoinositides and clathrin. The gene is associated with auxin signalling, transport, and metabolism, as well as the regulation of seed size, seed development, and reproductive structure development. It has been linked to numerous traits including gravity response, phototropism, blue light sensitivity, root and shoot architecture (lateral root number, shoot growth angle, branching), leaf and stamen morphology, seed set percent, and responses to brassinosteroids, gibberellic acid, ethylene, osmotic stress, and herbicides. Localisation evidence connects the protein to the auxin efflux carrier complex, recycling endosome, and basal and apical plasma membrane. Studies of related genes in other species link the family to polar auxin transport, leaf vascular patterning, phototropism, root meristem growth, and flower formation.