SUC1 — Phaseolus vulgaris

Summary

PHAVU_004G085500, designated PvSUC1 (also known as PvSUT5, PvSUT1, PvSUT2, SUC1, SUC5, SUC6, SUC7, SUC8, and ATSUC1/ATSUC2/ATSUC5), encodes a protein belonging to the sucrose symporter plant family and the major facilitator superfamily. This French bean (Phaseolus vulgaris) gene on chromosome 4 is associated with phloem sucrose loading, glucoside and maltose transport, proton transmembrane transport, and sucrose metabolism. It has been linked to grain yield, grain size, unfilled grain number, sucrose content, photosynthetic rate, drought tolerance, pollen fertility, root thickness, stomatal resistance, and auxin sensitivity. The gene is also connected to cell cycle regulation, embryo sac cellularization, cytokinesis by cell plate formation, photoprotection, and response to nematodes. Localization evidence associates the product with the tonoplast, plasmodesma, Golgi complex, pollen tube, and stress granules. Studies of related genes in other species link the family to phloem transport, carbon partitioning, pollen tube growth, anther dehiscence, root growth, cold acclimation, and grain yield.