SUS1 — Solanum tuberosum

Summary

PGSC0003DMG400013547 (SUS1) on potato chromosome 7 encodes a protein with sucrose synthase activity (EC 2.4.1.13) and also exhibits DNA binding and transcription factor activity. The gene is associated with sucrose metabolism, transport, and breakdown, as well as starch metabolism and anabolism, phloem unloading, and flavonol metabolism. SUS1 is linked to total soluble sugar content, starch content, sucrose content, fruit quality, grain yield, and carotenoid content. It is also associated with responses to flooding, hypoxia, drought, osmotic stress, and temperature extremes, along with traits such as photosynthetic rate, respiration rate, root development, leaf senescence, and cell elongation. The protein localises to the cytosol, nucleus, vacuole, and plasmodesmata. Studies of related genes in other species link the sucrose synthase family to grain yield, starch biosynthesis, cellulose biosynthesis, and tolerance to drought, chilling, and heat stress.