Abstract
The effect of indole-3-butyric acid (IBA) and polyvinylpyrrolidone (PVP) on root development on 1-year-old Corylus avellana L. cuttings was investigated. Treatment with IBA resulted in a higher percentage of rooted cuttings, the roots being more abundant and longer when compared with controls. Conversely, PVP did not affect the frequency of rooting. Rooting was accompanied by histological changes that started with proliferation of certain zones of the phloem parenchyma, and which converted into meristematic centers that were the origin of root primordia. These primordia developed vascular transition tissues and passed through the cortical tissues, which appeared partly disorganized by the pressure of the growing root. Accumulation of starch granules was observed in the cells at the base of rooted cuttings, but they were absent in non-rooted ones.
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