INV1 — Cucumis sativus

Summary

CsINV1 (CSA_3G777580) encodes a beta-fructofuranosidase (invertase, EC 3.2.1.26) with sucrose alpha-glucosidase and O-glucosyl hydrolase activities, belonging to the Glyco_hydro_32 family. In cucumber, this cell-wall invertase is associated with phloem unloading, carbohydrate storage, nectar secretion, pollen hydration and maturation, dehiscence, syngamy, regeneration, and regulation of photosynthesis, photorespiration, chlorophyll fluorescence, and membrane transport. It localizes to the pollen tube, vacuole, apoplast, and plant-type cell wall. The gene is associated with fruit weight and size, sugar and starch content, photosynthetic rate, quantum yield, photochemical quenching, stomatal resistance, respiration rate, plant height, and drought tolerance. Reduced cell-wall invertase activity in this gene is associated with no nectar secretion and altered phenylpropanoid metabolism. Studies of related genes in other species connect the family to fruit sweetness, hexose content, cold-induced sweetening, male sterility, and nectar production.