SUS1 — Daucus carota subsp. sativus

Summary

DCAR_028527 (SUS1) on carrot chromosome 8 encodes a sucrose synthase with sucrose synthase activity, transglycosidase activity, and DNA-binding transcription factor activity. It is associated with responses to hypoxia, flooding, sorbitol, mannitol, nitrate starvation, glucose, and sucrose, as well as starch and cellulose anabolism, auxin polar transport, ROS metabolism, seed and ovule development, and nodulation. The protein localizes to the cytosol, nucleus, vacuole, and plasmodesmata. SUS1 is linked to total soluble sugar, sucrose, carotenoid, and anthocyanin content, grain yield, fruit quality, seed size, root development, photosynthetic rate, and responses to high and low temperature stress. It has been connected to hypoxia tolerance, sink strength, drought response, cold stress tolerance, and waterlogging susceptibility. Studies of related genes in other species link the family to grain yield, starch biosynthesis, and drought tolerance.