SPS — Nicotiana attenuata

Summary

A4A49_34398 (symbol SPS, also known as SPD1, SPDS1, SPDS2, SPDSY) in coyote tobacco (Nicotiana attenuata) on scaffold02398 encodes a protein with spermidine synthase and spermine synthase activities (EC 2.5.1.16). The gene is associated with polyamine, spermidine, and spermine anabolism, as well as sucrose metabolism and phloem loading. It is linked to primary growth, flower development, and defence response to bacteria. Localisation evidence links the product to the cytosol, nucleus, mitochondria, and plasma membrane. The gene is associated with photosynthetic rate, respiration rate, starch and sucrose content, jasmonic acid content, and responses to high temperature, drought, and salt stress. It is also linked to disease tolerance, thermotolerance, and resistance to Botrytis cinerea and Pseudomonas syringae. Studies of related genes in other species link the family to polyamine metabolism, heat stress tolerance, and saline-alkali tolerance.