Abstract
A histological study of stem cuttings collected from 4-year-old Piceaabies and planted under intermittent mist, revealed the presence of a closing layer and wound periderm during wound healing and root primordia near leaf traces. No callus tissue was formed. Approximately 14 days after planting, root initiation started in phloem ray parenchyma cells. Root initials divided tangentially or in a slightly oblique plane. After 28 days, root primordia developed when cells divided in various planes. Between the 28th and the 35th day, the morphological differentiation of root primordia began. After 35 days, many primordia possessed an apical meristem, a young rootcap, and the beginning of a vascular cylinder and cortical parenchyma. The roots emerged either through, or a few millimetres above, the basal end of the cuttings. Parenchyma cells located at the proximal end of the roots differentiated into vascular elements and provided a vascular connection between the newly formed organs and the stems.
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