SUT — Nicotiana attenuata

Summary

A4A49_07351 (SUT) in coyote tobacco (Nicotiana attenuata) on scaffold00073 encodes a protein belonging to the sucrose symporter family and the major facilitator superfamily. The gene product exhibits sucrose:proton symporter activity, along with maltose, arbutin, salicin, and biotin transmembrane transporter activities. SUT is associated with phloem sucrose loading, maltose transport, and carbohydrate membrane transport. It has been linked to numerous agronomically relevant traits including grain yield, unfilled grain number, grain weight, sucrose and sugar content, photosynthetic rate, root dry weight, leaf chlorosis, days to flowering, seed dormancy, trichome morphology, jasmonic acid content, and stress responses. Localization evidence connects the protein to the tonoplast, chloroplast membranes, pollen tube, and cis-Golgi network. Studies of related genes in other species link the SUT family to phloem transport, carbon partitioning, tuberization, flowering time, grain size, yield, and abiotic stress tolerance.