SPS — Solanum tuberosum

Summary

PGSC0003DMG400024232, designated StSPS on potato chromosome 4, encodes a protein with spermine and spermidine synthase activity (EC 2.5.1.16) and belongs to the spermidine/spermine synthase family. The gene is associated with polyamine, sucrose, starch, and phenylpropanoid biosynthesis, as well as sucrose breakdown, alkaloid metabolism, nitric oxide storage, circadian rhythm, signal transduction, and defence responses to bacteria. It has been linked to starch yield and content, sugar and protein content, jasmonic acid content, photosynthetic rate, chlorophyll content, plant height, respiration rate, high temperature stress response, drought stress response, and salt stress response. Associations also include disease resistance to Botrytis cinerea and Pseudomonas syringae, nematode susceptibility, and thermotolerance. The protein localises to mitochondria, cytosol, plasma membrane, and nucleus. Studies of related genes in other species link the family to saline-alkali tolerance and polyamine metabolism.