Investigation on carob (Ceratonia siliqua L.) propagation by cutting

H. Gubbuk, S. Guler, R. Balkıc
Grafting is the most common vegetative propagation method applied for carob. The numbers of rooting studies on carob cuttings using other vegetative propagation techniques are very limited in the world as well as in Turkey. Rooting performance of carob cuttings were found to differ according to reports from some countries. Therefore, there is much more information needed to be elucidated for this vegetative technique which thus constitutes the main objective of this study. One-year-old shoots of 1-cm diameter and 20-25 cm in length of carob 'Kıbrısi' type were used in this study. Cuttings with and/or without terminal buds were taken at different periods of growth (April and May). Cuttings were treated with different concentrations of auxins as follows: T1 (control), T2 and T3, respectively, dipping in a solution of 7000 and 9000 ppm of indole butyric acid (IBA), T4 (wounded bottom of cuttings), T5 and T6 consist of wounded bottom of cuttings and dipping, respectively, in a solution of 7000 or 9000 ppm of IBA treatments. Perlite was used as rooting media and experiments were carried out under unheated glasshouse. Rooting percentage, number of primary roots, root length and root diameter were evaluated on rooted cuttings. Rooting performance was found limited with only some of the treatments producing a low percentage of roots. Roots were observed only in T3, T5 and T6 treatments with at rates of 10.0, 13.3 and 10.0% rooting ratio, respectively, on cuttings with terminal bud taken in April. The other cuttings without terminal buds showed very few roots on treatments T2, T4 and T6 of April cuttings and treatments T3, T5 and T6 of May cuttings with rooting rate between 3.3 to 6.7% depending on the treatments. Considering the scarcity of cutting production of carob tree and the requested labor to process it, the results strongly suggest that carob production via cuttings is not a best approach for carob 'Kıbrısi' type under experimented conditions described in this work.
Gubbuk, H., Guler, S. and Balkıc, R. (2020). Investigation on carob (Ceratonia siliqua L.) propagation by cutting. Acta Hortic. 1280, 263-268
DOI: 10.17660/ActaHortic.2020.1280.36
vegetative propagation, cultivated type, rooting time, rooting type, IBA, NAA

Acta Horticulturae