The miR173-tasiRNAs- PPR / TPR network is significantly altered in the OE lines. Circles are 21-nt small RNAs that are perfectly mapped to TAS loci; red circles: Increase in small RNAs abundance in both OE lines (ratio ≥ 2, P < 0.05); blue circles: Decrease in small RNAs abundance in both OE lines (0 < ratio ≤ 1/2, P < 0.05); yellow circles: small RNAs which are not significantly changed in the OE lines. Green squares: potential PPR targets. Green triangles: potential TPR targets. Dark green squares: TAS1A, 1B, 1C, TAS2 and MIR 173 genes.