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Morphological changes in the ultrastructure of the basal stem of carnation cuttings during adventitious rooting. Light micrographs were taken from cross-sections of stem cutting basal regions in the 2003 R 8 (a-d) and 2101–02 MFR (e-h) cultivars, either treated with mock (a-b, e-f) or with auxin (c-d, g-h) at different time intervals (0 and 54 hAP). ca, cambium; cc, cell clusters; pl, phloem; xl, xylem. Scale bars: 50 μm
