LTN1 — Oryza sativa Japonica

Summary

OS05G0557700 (LTN1, also known as OsUBC24, UBC24, OsPHO2, PHO2) on rice chromosome 5 encodes a protein with ubiquitin-conjugating enzyme activity, ubiquitin-protein transferase activity, inositol hexakisphosphate (IP6) binding, and phosphate transmembrane transporter activity. The protein localises to the nucleus, plasma membrane, endoplasmic reticulum, Golgi, mitochondria and trans-Golgi network. LTN1 is associated with phosphate homeostasis, transport and starvation responses, root and shoot development, seed development, starch metabolism, pollen germination, innate immunity, and regeneration. Phenotypic associations include inorganic phosphate (Pi) homeostasis, root architecture, leaf senescence, flowering time, and responses to salt, low temperature and abscisic acid. The gene is linked to agronomic traits such as grain yield, plant height, tiller number, shoot growth angle, phosphorus content and uptake, anthesis time, and reproductive period. Studies of related genes in other species link the family to phosphate loading to the xylem and arsenic accumulation.