X‐ray computed tomography on wild‐type (WT) and PDR1 OE Petunia hybrida roots. X‐ray computed tomography on roots of 8‐wk‐old petunia plants. (a) Heat map (root thickness) of WT (left) and PDR1 OE (right) roots grown on clay+. (b) Quantification of lateral roots in WT and PDR1 OE roots ± myc. (c) Ratio of PDR1 OE : WT root volumes and root surfaces +/– myc. (d–g) Digital rendering (via Fiji software) of WT (d, f) and PDR1 OE (e, g) roots: (d, e) top view; (f, g) bottom view. Bars: (a) 4 cm; (d–g) 1 cm. Values are means ± SE. *, P < 0.05.