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. 2018 Jul 27;19(8):2201. doi: 10.3390/ijms19082201

Figure 1.

Figure 1

Time course and anatomical structure of AR formation in stem cuttings of ‘T337’ apple rootstocks. Time course of AR formation: S1 (stage 1) indicates the initial placing of the cuttings into rooting medium (0 days); S2 (stage 2) indicates that the cuttings were in the root medium for 3 days; S3 (stage 3) indicates that the cuttings were cultured in the rooting medium for 9 days; S4 (stage 4) indicates that the cuttings were cultured in the rooting medium for 16 days. Anatomical changes in stem cuttings of apple rootstock during AR formation. Stem cuttings of apple rootstock did not exhibit changes in the control. Under IBA-treatment (1) Young stem cross-section at 0 days (×60), PI (primordium initiation) indicates primordium initiation site; (2) evidence of vigorous cambium cell division at 3 days (×60), PI indicates primordium initiation site; (3) AR primordia are visible at 9 days (×40), RP (root primordium) indicates root primordium site; (4) elongation and outgrowth of ARs elongated at 16 days (×60), RP (root primordium) indicates root primordium site. Left and right sides of the figure represent control and IBA treatments, respectively. The positions pointed by arrows represents the region of AR primordium formation.