INV1 — Solanum lycopersicum

Summary

SlINV1 (INV1, CWIN2) on tomato chromosome 9 encodes a protein with glycoside hydrolase family 32 domains, and has beta-fructofuranosidase and sucrose alpha-glucosidase activities. The enzyme localises to the apoplast, plant-type cell wall and pollen tube. SlINV1 is associated with phloem unloading, hexose breakdown, carbohydrate storage, nectar secretion, fruit abscission, and responses to amino acids and nickel. It has been linked to numerous fruit quality and yield traits including fruit sweetness, weight, size, volume, firmness, colour, shape, dry weight, and total soluble sugar, glucose, sucrose and starch content, as well as flower abortion, inflorescence number, seed weight and size, leaf size, photosynthetic rate, water use efficiency, and heterosis. Related genes in other species link the family to nectar production and male sterility, and to cold-induced sweetening.