INV1 — Solanum lycopersicum

Summary

SlINV1 (INV1, CWIN2) on tomato chromosome 10 encodes a protein with beta-fructofuranosidase and sucrose alpha-glucosidase activities, belonging to the glycoside hydrolase family 32. The enzyme is localised to the apoplast, plant-type cell wall and pollen tube. SlINV1 is associated with phloem unloading, sucrose and hexose breakdown, carbohydrate storage, nectar secretion, fruit abscission, light absorption, response to water and amino acids, phosphate metabolism, differential growth, and mitosis. The gene has been linked to fruit sweetness, dry weight, firmness, colour, size, and sugar, starch, protein and proline content, as well as seed weight, leaf size, root length, chlorophyll content, net photosynthetic rate, water use efficiency, stomatal resistance, drought tolerance, salt tolerance, flower abortion, and respiration rate. Studies of related genes in other species connect the family to male sterility, nectar production, and cold-induced sweetening.