INITIATION AND DEVELOPMENT OF ADVENTITIOUS ROOTS IN STEM CUTTINGS OF HEDERA HELIX: ANATOMICAL STUDIES OF THE JUVENILE GROWTH PHASE

摘要

Anatomical studies were made of adventitious root formation in the internodes of cuttings from juvenile phase plants ofHedera helix, English ivy. Observations showed that adventitious roots originate in phloem ray parenchyma above the basal cuts within a period of 6ndash;10 days. The actual emergence of the roots is at right angles to the main axis of the stems and the roots appear 10ndash;14 days after the cuttings are made. Fibers are present in groups external and tangential to the phloem strands, but they do not inhibit development of the roots.