Expression analysis of 19 selected <i>PtrDof</i> genes in roots under osmotic stress using qRT-PCR.

<p>The relative mRNA abundance of 19 selected <i>PtrDo</i><b><i>f</i></b> genes was normalized with respect to the reference gene (<i>Actin1</i>). These genes were downregulated in roots under drought stress according to the HeatMap. Error bars represent the standard deviations of three biological replicates. Asterisks indicate stress treatment groups that showed a significant difference in transcript abundance compared with the control group (* P < 0.05, ** P < 0.01).