INV1 — Solanum lycopersicum

Summary

SlINV1 (INV1, CWIN2, CWIN4) on tomato chromosome 10 encodes a cell-wall invertase with beta-fructofuranosidase and sucrose alpha-glucosidase activities, belonging to the Glyco_hydro_32 family. 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, regulation of photosynthesis, light absorption, phosphate metabolism, differential growth, and response to water. The gene has been linked to fruit sweetness, dry weight, firmness, size, colour, and starch and sugar content, as well as seed weight, leaf size, root length, chlorophyll content, photosynthetic rate, water use efficiency, drought tolerance, and salt tolerance. Related genes in other species are linked to male sterility and nectar production, and to cold-induced sweetening.