INV1 — Solanum tuberosum

Summary

PGSC0003DMG400008943, the potato INV1 gene on chromosome 9, encodes a beta-fructofuranosidase (invertase) with sucrose alpha-glucosidase and O-glucosyl hydrolase activities, belonging to the Glyco_hydro_32 family. INV1 is associated with cold-induced sweetening, a key postharvest trait, and has been linked to reducing sugar content, starch yield, sucrose content, and photosynthetic rate. The gene is associated with phloem unloading, carbohydrate storage, nectar secretion, and both sucrose and starch breakdown. INV1 is also associated with flavonol metabolism, microsporogenesis, plant ovule development, and defence responses to bacteria and fungi. The encoded protein localises to the apoplast, plant-type cell wall, and pollen tube. Studies of related genes in other species link the family to fruit sweetness, hexose content, male sterility, seed development, and nectar production.