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

摘要

Adventitious root formation was studied microscopically in stem cuttings of a difficult-to-root plant, the mature growth phase ofHedera helix, English ivy. Roots were found initiating at the end of 2ndash;4 weeks in phloem ray parenchyma of internodes with and without woundwood and in callus near the basal end of cuttings; roots emerged at the end of 3ndash;5 weeks. The fibro-bundle caps were thicker than those found in juvenile stems, but they did not hamper the development of adventitious roots.