Fig. 9.

Working model of the WRKY‐PHT1;1 regulatory pathway in maintaining P homeostasis in rice (Oryza sativa). Elbowed arrows in dark indicate the transcriptional expression of OsWRKY21, OsWRKY108, OsPHT1;1 and PSI OsPHT1s genes, and the thickness of the line represents the relative transcription level. Inverted droplet shapes in colours indicate different transcription factors: 21, WRKY21; 108, WRKY108; WRKY, other unknown WRKY members; PHR, Phosphate Starvation Response transcription factors; TF, other unknown transcription factors. Red and orange rectangles indicate W‐box and PHR1 Binding Sequence (P1BS), respectively. Green arrows indicate that TFs can bind directly to the motif(s) on the promoters of OsPHT1 family genes.