SPS — Asparagus officinalis

Summary

A4U43_C03F31190 (SPS, AoSPS) on asparagus chromosome 3 encodes a sucrose synthase domain-containing protein with sucrose-phosphate phosphatase, sucrose-phosphate synthase, sucrose synthase, and protein serine/threonine phosphatase activities, and binds calcium, magnesium, and protein kinases. The gene is associated with carbohydrate storage and metabolism, nectar secretion, pollen wall assembly, autotrophy, and regulation of abscisic acid-mediated signalling, stomatal movement, and responses to heat, cold, and abscisic acid. It localises to the cytosol, nucleus, ER, plasmodesma, and plasma membrane. Associations include vegetative vigour, carbohydrate and sucrose content, seed yield, net photosynthetic rate, shoot branching, root development, flowering time, cold and oxidative stress response, and disease tolerance. Related genes in other species link the family to abscisic acid signalling, stomatal regulation, drought tolerance, and pathogen susceptibility.