SPS — Solanum tuberosum

Summary

PGSC0003DMG400037026, designated StSPS on potato chromosome 6, encodes a putrescine N-methyltransferase that also exhibits spermidine and spermine synthase activities. The gene is associated with polyamine, sucrose, starch, nicotine, alkaloid and phenylpropanoid metabolism, as well as circadian rhythm, response to insects, and nitric oxide storage. Its product localises to the cytosol, nucleus, mitochondria and plasma membrane. StSPS is associated with starch yield and content, sugar and protein content, photosynthetic rate, chlorophyll content, plant height, respiration rate, jasmonic acid content, high temperature stress response, and disease tolerance. Associations also include drought and salt tolerance, thermotolerance, nematode susceptibility, salicylic acid-mediated defence, and resistance to Botrytis cinerea and Pseudomonas syringae. Related genes in other species link the family to saline-alkali tolerance, polyamine metabolism, and heat stress tolerance.