Folia Horticulturae

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Assessment of possibilities of Eucalyptus gunnii Hook. propagation by cuttings from seedlings

Zbigniew Koziara

Department of Ornamental Plants
Faculty of Horticulture, University of Agriculture in Kraków
29 Listopada 54, 31-425 Kraków, Poland
e-mail: zkoziara@ogr.ar.krakow.pl

In a study on the vegetative propagation of Eucalyptus gunnii Hook. 100-130-day old seedlings were used to obtain four types of cutting: two-nodal and three-nodal cuttings, those with a heel, and apical ones. The cuttings were taken from mother plants and rooted on three dates from mid-July to mid-September. After six weeks of rooting the percentage of rooted cuttings (R), those with callus (C), and the died-off ones was determined for every type of cutting. For combinations with the percentage of died-off cuttings below 20 the following ranking of rooted ones could be given: three-nodal cuttings (R) 10% + (C) 71% = 81%, two-nodal cuttings (R) 7% + (C) 79% = 86%, and those with heels (R) 3% + (C) 84% = 87%. Apical cuttings showed the poorest quality with a very high share (60%) of died-off shoots and with (R) 4% + (C) 36% = 40% only, showing the lowest rooting capacity. In complementary experiments conducted with three-nodal cuttings the value of commercial hormonal preparations B2, AB, and A (produced by the firm “HIMAL” at Łódź) was checked. The best results were obtained with preparation A (containing 0.3% IBA) giving a 3.2-fold increase in rooting cuttings in relation to the control combination. The preparations AB and B2 were found to be less effective, inducing a 2.2- and 1.2-fold increase in rooting, respectively, in relation to the control. The percentage of rooted control cuttings amounted to 7.47. It was found that the juvenile forms of Egunnii constituted a potentially good starting material for obtaining cuttings, though it is necessary to elaborate conditions ensuring better rooting of cuttings with developed callus.

Koziara Z., 2003. Assessment of possibilities of Eucalyptus gunnii Hook. propagation by cuttings from seedlings. Folia Horticulturae 15/1: 95-104.