INV1 — Daucus carota subsp. sativus

Summary

DCAR_009173 (symbol INV1, also known as DcINV1) on carrot chromosome 3 encodes a beta-fructofuranosidase (invertase) with sucrose alpha-glucosidase and O-glucosyl hydrolase activities, belonging to the Glyco_hydro_32 family. The gene is associated with phloem unloading, carbohydrate storage, nectar secretion, and sucrose breakdown, as well as starch metabolism, root development, and defence responses to bacteria and fungi. Its product localises to the apoplast, plant-type cell wall, and pollen tube. INV1 has been linked to carbohydrate, sucrose, and sugar content, photosynthetic rate, and respiration rate, and to phenotypes including reduced cell wall invertase activity and altered phenylpropanoid metabolism. Studies of related genes in other species connect the family to cold-induced sweetening, male sterility, and nectar production.