Journal Of Applied Horticulture ISSN: 0972-1045


S. Caruso and G. Iapichino

Department of Agricultural and Forest Sciences, University of Palermo, Viale delle Scienze, Palermo.

Key words: Plumeria rubra, propagation, adventitious roots, bottom heat, cutting size, frangipani

Journal of Applied Horticulture, 2015, volume 17, issue 1, pages 22-25.

Abstract: Root development of hardwood cuttings of Plumeria rubra was investigated in relation to basal heat and the size of cuttings. Terminal cuttings of a clone grown in Sicily were trimmed to various lengths, ranging from 10 to 26 cm. To verify the cutting rooting response to basal heat, half of the cuttings were placed on a basal heated bench (28±3 °C, constant temperature) while the remaining were placed on an unheated bench (16-18 °C during the night and 20-22 °C during the day). Percent rooting and cutting survival were not affected by basal heat and cutting length. However, basal heat positively affected number of roots, length of longest root and bud growth. Increases in the length of the cutting resulted in a parallel increase in adventitious root formation. Medium (16-20 cm) and long (22-26 cm) length cuttings exposed to basal heat exhibited the best development in terms of number of roots, root length and bud growth. We suggest that in the Mediterranean region the use of basal heat and of medium/long size cuttings may be beneficial to propagators wishing to produce P. rubra rooted cuttings with well-developed root system.

Journal of Applied Horticulture