SPMS — Oryza sativa Indica Group

Summary

BGIOSGA023029 (SPMS, OiSPMS) on Indica rice chromosome 6 encodes a protein with spermine synthase and spermidine synthase activities, also annotated with DNA-binding transcription factor activity and protein binding. It is associated with polyamine, spermidine, and spermine biosynthesis, the ascorbate-glutathione cycle, shikimate pathway, and indole glucosinolate biosynthesis. The gene is linked to induced systemic resistance, defense responses involving callose deposition, and responses to insects and bacteria. Associations include jasmonic acid content, photosynthetic rate, chlorophyll content, salt tolerance, drought tolerance, thermotolerance, disease tolerance, grain yield, grain size, seed germination, and root growth. The protein localizes to mitochondria, cytosol, plasma membrane, and nucleus. Studies of related genes in other species link the family to polyamine metabolism, heat stress tolerance, callose deposition, and resistance to bacterial pathogens.