ISHS Acta Horticulturae 545: V International Protea Research Symposium
INFLUENCE OF CUTTING POSITION, WOUNDING AND IBA ON THE ROOTING OF LEUCOSPERMUM CORDIFOLIUM `CALIFORNIA SUNSHINE´ CUTTINGS |
| Authors: | J.A. Rodríguez-Pérez, M.C. Vera-Batista, A.M. de León-Hernández, P.C. Armas-Armas |
| Keywords: | Proteaceae, propagation |
| Abstract:
Terminal cuttings are usually recommended for the vegetative propagation of Leucospermum spp., although some commercial nurseries also use basal cuttings. L. cordifolium `California Sunshine´ is relatively easy to propagate from terminal cuttings, but no data has been reported using basal cuttings. In order to study if wounding (two shallow and opposite incisions) alone or combined with IBA treatments (0, 2000, 4000 ppm) could improve the rooting process, during winter a trial was carried out in which terminal and basal cuttings were rooted with bottom heat (22 ± 2º C) on microjet irrigation. Lack of hormonal treatment delayed significantly rooting in unwounded and wounded basal and terminal cuttings. Nearly satisfactory rooting from the commercial point of view (73.3%) was obtained 6 weeks after planting when using wounded basal cuttings treated with 4000 ppm of IBA. At the end of the trial, at 12 weeks, unwounded terminal cuttings treated with 4000 ppm of IBA gave the best result (86.7% of transplantable cuttings). Wounding alone or combined with IBA did not improve rooting significantly compared with hormonal treatment alone. In wounded cuttings two ranks of callus nodules appeared along the edges of each incision. Roots emerged associated with the ranks of callus nodules, but they also emerged through the bark in unwounded areas between the incisions. | |
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