INV1 — Nicotiana attenuata

Summary

A4A49_29758 (INV1) on chromosome 10 of coyote tobacco (Nicotiana attenuata) encodes a beta-fructofuranosidase (invertase) with sucrose alpha-glucosidase activity, belonging to the glycosyl hydrolase 32 family. The gene is associated with carbohydrate metabolism, including sucrose breakdown, starch metabolism, and regulation of carbohydrate metabolism, as well as phloem loading and unloading, nectar secretion, and secondary metabolite biosynthesis. It has been linked to seed development, plant ovule development, leaf senescence, and syngamy. The encoded protein localises to the apoplast, plant-type cell wall, and pollen tube. INV1 is associated with traits including leaf length, seed size, photosynthetic rate, respiration rate, and phosphate and abscisic acid content. Reduced cell wall invertase activity is linked to loss of nectar secretion. Related genes in other species are associated with fruit sweetness, grain size, and male sterility.