Effects of Cutting Time and IBA Treatment on Rooting of Rhododendron Summer Cuttings Collected from Turkish Flora

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Altun B., Çelik H., Gümüş H., Sağlam S., Eminağaoğlu Ö., Türet M., ...Daha Fazla

Scholars Bulletin (Agricultural Science), cilt.3, sa.12, ss.662-666, 2017 (Hakemli Dergi)

Özet

This study was carried out to determine the possibilities of vegetative propagation of the widespread 5 Rhododendron species (R. ponticum L, R. luteum Sweet, R. smirnovii Trautv, R.ungernii Trautv, and R. caucasicum Pallas) in Turkey. The plant material was obtained as shoot tip cuttings from the Black Sea Region flora three times (June, July, and August). The respective cutting materials were subjected to 5 Indole-3-butyric acid (IBA) doses (0, 4000, 8000, 12000, and 16000 ppm) and planted in acidic peat and perlite mixture under mist propagation in greenhouse conditions. Sixty cuttings (20 cuttings with 3 replicates) were used for each treatment. 300 cuttings were used. Results showed that three rhododendron species (R. ponticum, R. luteum, and R. smirnovii) were successfully rooted but the others (R. ungerni and R. caucasicum) were not. Only 16.000 ppm IBA gave the highest rooting rate (46.67%). The highest rooting rates were obtained in R. ponticum at 46.66 % from August cuttings, in R. luteum at 38.33% from June cuttings, and R. smirnovii at 13.33% from August cuttings. To conclude, when the cutting materials were obtained in the summer season, their rooting rates were quite low in Rhododendron species, suggesting that when it is difficult to reach these plants in heavy winter conditions, it can be worked on summer cuttings even low rate of rooting.