ISHS Acta Horticulturae 226: International Symposium on Propagation of Ornamental Plants
THE EFFECT OF CYTOKININ AND AUXIN ON THE SPROUTING AND ROOTING OF ‘AMANDA’ ROSE SOFTWOOD CUTTINGS |
| Authors: | L. A.M. Dubois, D.P. De Vries |
| Abstract:
The combined effect of BA (7 concentrations) and IBA (6 concentrations) was studied relative to the sprouting of the axillary bud and adventitious root formation of 21-day-old 'Amanda' rose softwood cuttings. BA had no significant effect on time and frequency of sprouting; as IBA concentration increased time and frequency were increasingly inhibited. Sprout length decreased as BA concentration increased; IBA on the whole promoted sprout length, particularly at low concentrations. Sprouting of the secondary buds was promoted by BA, at the highest concentrations 3 sprouts per axil occurred; IBA acted antagonistically. Percentage of rooted cuttings and root fresh weight were increasingly lower as BA concentration was higher; IBA had no effect on percentage of rooting, but it induced heavier roots. In spite of its significant effects on the sprouting of 'Amanda', BA cannot substitute breeding of better branching genotypes of pot roses. The use of IBA in low concentrations is beneficial to culture, as it promotes root weight and initial shoot length. | |
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