SPS — Solanum lycopersicum

Summary

SOLYC06G053510.3 (SlSPS) encodes a protein with putrescine N-methyltransferase, spermine synthase and spermidine synthase activities. The gene is associated with light absorption, phloem unloading, sucrose transport, and the regulation of carbohydrate and primary metabolism. In tomato, SlSPS is linked to saline-alkali stress tolerance. Broader associations link the gene to fruit sweetness, starch and sugar content, net photosynthetic rate, chlorophyll content, leaf size, root dry weight, and responses to high temperature, drought, and disease, including resistance to Botrytis cinerea and Pseudomonas syringae. The encoded protein localises to the cytosol, mitochondria, nucleus and plasma membrane. Studies of related genes in other species connect the family to polyamine metabolism and heat stress tolerance.