INV1 — Solanum lycopersicum

Summary

SlINV1 (INV1, CWIN2, CWIN4) on tomato chromosome 10 encodes a protein with glycoside hydrolase family 32 domains and beta-fructofuranosidase and sucrose alpha-glucosidase activities. The protein 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, mitosis, and response to water. It is linked to fruit sweetness, dry weight, firmness, size, colour, and weight, as well as starch and sugar content, seed weight, leaf size, root length, chlorophyll content, photosynthetic rate, water use efficiency, stomatal resistance, drought tolerance, and salt tolerance. Reduced cell-wall invertase activity and loss of nectar secretion have been observed in association with this gene.