Transcription factors responsive to P-stress
Consistent with the massive transcriptional reprogramming evident from
transcriptome analysis, several families of transcription factor (TF)
genes were found to be enriched amongst DEGs, (Figure 5c ).
These included the TF families AP2, bHLH, bZIP, MYB, WRKY, NAC, and GRAS
(Figure S4) . Under severe P-stress, more than twice as
many TF genes were repressed than were induced, consistent with the
overall greater number of genes repressed than induced under these
growth-limiting conditions (Figure 5b ). Further
analysis of TF families showed that 75% of the GRAS TF family were
induced in roots while 95% of the B3 TFs family were induced in roots
and shoots (Figure S4 ).