INV1 — Nicotiana attenuata

Summary

A4A49_06530 (INV1) in coyote tobacco (Nicotiana attenuata) encodes a protein with beta-fructofuranosidase and sucrose alpha-glucosidase activities, belonging to the glycosyl hydrolase 32 family. The gene is associated with phloem loading and unloading, carbohydrate storage and metabolism, nectar secretion, seed and ovule development, leaf senescence, and secondary metabolite biosynthesis. Its product localizes to the apoplast, plant-type cell wall, and pollen tube. INV1 is associated with traits including seed size, leaf length, photosynthetic and respiration rates, and phosphate, abscisic acid, and cytokinin content. Reduced cell-wall invertase activity is associated with loss of nectar secretion. Studies of related genes in other species link the family to fruit sweetness, hexose and starch content, grain size, male sterility, and cold-induced sweetening.