INV1 — Nicotiana attenuata

Summary

A4A49_27620 (INV1) in coyote tobacco (Nicotiana attenuata) encodes a protein with beta-fructofuranosidase and sucrose alpha-glucosidase activities, belonging to the glycosyl hydrolase family 32. The gene is associated with phloem unloading and loading, sucrose breakdown, carbohydrate storage, nectar secretion, seed development, leaf senescence, and plant ovule development. Its product localizes to the apoplast, plant-type cell wall, and pollen tube. INV1 is associated with traits including seed size, leaf length, photosynthetic rate, respiration rate, phosphate and phosphorus uptake, and abscisic acid and cytokinin content. Reduced cell-wall invertase activity and loss of nectar secretion have been observed in association with this gene. Studies of related genes in other species connect the family to fruit sweetness, hexose content, grain size, starch concentration, male sterility, and cold-induced sweetening.