SUT — Solanum tuberosum

Summary

PGSC0003DMG400025610 (SUT, SUT2) on potato chromosome 5 encodes a sucrose transporter belonging to the major facilitator superfamily (MFS). The protein exhibits sucrose:proton symporter activity and is associated with phloem sucrose loading and unloading, maltose transport, and carbohydrate membrane transport. In potato, SUT4 is linked to tuberization, flowering, and shade avoidance, while SUT2 is associated with yield and tuber starch content. The gene is associated with numerous traits including grain yield, starch content, sugar content, photosynthetic rate, water use efficiency, and stress responses. It localizes to the tonoplast, chloroplast outer membrane, and cis-Golgi network. Studies of related genes in other species link the family to phloem transport, carbon partitioning, seed development, and abiotic stress tolerance, as well as to flowering time and mycorrhization.