SPS — Nicotiana attenuata

Summary

A4A49_28211 (SPS, SPS1) in Nicotiana attenuata encodes a protein with sucrose-phosphate synthase, sucrose-phosphate phosphatase, and sucrose synthase activities, along with protein kinase and calcium ion binding. It is associated with sucrose anabolism and metabolism, UDP anabolism, phloem loading, nectar secretion, primary growth, flower development, regulation of stomatal movement, and abscisic acid-mediated signaling. The gene is linked to traits including sucrose and starch content, seed yield, vegetative vigor, photosynthetic rate, respiration rate, flowering time, shoot branching, root development, and responses to cold, oxidative stress, and powdery mildew. It localizes to the cytosol, nucleus, endoplasmic reticulum, plasmodesma, and plasmalemma. Studies of related genes in other species connect the family to grain size, tuber morphology, heat tolerance, and osmotic stress response.