Figure 3. Hypothetical model of transcriptional regulation of Polyamine biosynthesis in response to abiotic stress in rice. ABF represents the ABRE binding transcription factors, CBFS, MYB, WRKY represents the LTRE binding TFs, MYB TFs and W-box binding trans-acting factors respectively. GBFs represent the transcription factors binding to the GATA and SORLIPs respectively. Spds and Spms are spermidine synthase and spermine synthase respectively.