SUS1 — Daucus carota subsp. sativus

Summary

DCAR_024776 (SUS1) on carrot chromosome 7 encodes a sucrose synthase, possessing sucrose synthase activity and transglycosidase activity, and also shows DNA-binding 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, auxin polar transport, and seed and ovule development. It has been linked to numerous agronomic traits including total soluble sugar and sucrose content, grain yield, fruit quality, carotenoid and anthocyanin content, photosynthetic rate, respiration rate, seed size, root development, and responses to high and low temperature stress. The gene product localises to the cytosol, nucleus, vacuole, and plasmodesmata. Studies of related genes in other species connect sucrose synthase to grain yield, thermotolerance, drought tolerance, and chilling tolerance.