SUS1 — Daucus carota subsp. sativus

Summary

DCAR_024777 (SUS1, DcSUS1) on carrot chromosome 7 encodes a sucrose synthase protein (EC 2.4.1.13) with sucrose synthase activity, and also possesses DNA-binding and transcription factor activity. The gene is associated with responses to hypoxia, flooding, sorbitol, mannitol, nitrate starvation, glucose, and sucrose, as well as starch and cellulose anabolism, ROS metabolic process, auxin polar transport, and seed and ovule development. It localises to the cytosol, nucleus, vacuole, and plasmodesmata. DcSUS1 is linked to numerous agronomic traits including total soluble sugar, sucrose, carotenoid, and anthocyanin content, grain yield, fruit quality, seed size, photosynthetic rate, and responses to high and low temperature stress. Studies of related genes in other species connect sucrose synthase to grain yield, thermotolerance, drought tolerance, and chilling tolerance.