Immunolocalisation of spermidine synthase in Solanum tuberosum

► Spermidine synthase catalyses the conversion of putrescine to spermidine. ► Spermidine is an essential precursor for spermine and thermospermine. ► Those polyamines contribute to drought stress tolerance and vascular tissue growth. ► Spermidine synthase protein was localised in phloem cells of the whole potato plant.