ISHS Acta Horticulturae 541: IV International Symposium on New Floricultural Crops
PROPAGATION OF POLYGALA MYRTIFOLIA BY CUTTINGS |
| Authors: | A. Akoumianaki-Iannidou, E. Kravari, J. Chronopoulos |
| Keywords: | Rooting hormone, IBA, Milkwort |
| Abstract:
The propagation of the ornamental shrub Polygala myrtifolia by cuttings over 5 periods (3 seasons) with the aid of rooting hormone was studied. Stem cuttings (10 cm approximately) from the top of new shoots (simple cuttings) and new shoots together with a small portion (0.3-0.5 cm) of old shoot (‘heel’ cuttings) were taken from different regions of foliage of 4 year old mother plants. Simple cuttings were taken in winter (January) and summer (August) of 1997 and 1998 and in autumn (November) of 1998. ‘Heel’ cuttings were taken in January 1997. The cuttings were treated with rooting hormone (IBA) in powder or liquid from at concentrations of 500, 1000 and 2000 ppm, and planted under mist in a rooting substrate of 1 : 1 (v/v peat : perlite and pH 6.5. Substrate temperature was 24-26oC and the cuttings were maintained under these conditions for 2 months irrespective of the season. The results showed that: Rooting was not affected by the type of cutting, i.e. simple or ‘heel’. The rooting hormone in either form had no effect on rooting irrespective of hormone concentration and season. Rooting of untreated cuttings was highest (98.3±1.7%) in warm period (summer) and lowest (41.7±11.7%) in the cold season (winter). In the autumn the percentage of rooting was 76.6%. | |
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