SS1 — Solanum tuberosum

Summary

StSS1 (PGSC0003DMG402018552) on potato chromosome 3 encodes a starch synthase with alpha-1,4-glucan glucosyltransferase activity (EC 2.4.1.21). The product is localized to the amyloplast, chloroplast stroma, and plastid, and is associated with amylopectin anabolism and starch biosynthesis. StSS1 is associated with starch yield, amylose content, reducing sugar content, and photosynthetic traits including net photosynthetic rate, transpiration rate, stomatal resistance, and chlorophyll content. The gene is also linked to responses to cold, root gravitropism, seed development, and endosperm development. Related genes in other species are linked to starch metabolism, altered starch composition with increased amylose and modified amylopectin structure, and seed weight.