SPS — Solanum tuberosum

Summary

PGSC0003DMG400004111 (SPS, also known as SPDSY) on potato chromosome 5 encodes a spermidine/spermine synthase, an enzyme with both spermidine synthase and spermine synthase activity (EC 2.5.1.16). The gene is associated with polyamine, sucrose, starch, and phenylpropanoid anabolism, as well as sucrose breakdown, RNA methylation, cell morphogenesis, and immune and nematode responses. It has been linked to traits including 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. Localisation evidence places the product in the cytosol, nucleus, mitochondria, and plasma membrane. Studies of related genes in other species link the family to polyamine metabolism, heat stress tolerance, and cadaverine sensitivity.