INV1 — Solanum lycopersicum

Summary

SlINV1 (INV1, CWIN2, CWIN4) on tomato chromosome 10 encodes a protein 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. It is linked to numerous agronomic traits including fruit sweetness, fruit weight, size, firmness, dry weight and colour, total soluble sugar, starch and protein content, seed weight, leaf size, root length, net photosynthetic rate, water use efficiency, stomatal resistance, chlorophyll content, proline content, respiration rate, relative growth rate, flower abortion, and drought and salt tolerance. A phenotype of reduced cell-wall invertase activity and no nectar secretion has been observed for this gene.