ISHS Acta Horticulturae 227: International Symposium on Vegetative Propagation of Woody Species
THE INFLUENCE OF P-ITB (PHENYL INDOLE-3-THIOLOBUTYRATE), AN ARYL ESTER OF IBA, ON THE ROOTING OF 'REDHAVEN' PEACH |
| Authors: | D. Avanzato, G.A. Couvillon, F.A. Pokorny |
| DOI: | 10.17660/ActaHortic.1988.227.31 |
| Abstract:
The root promoting value of aryl esters of IBA (indole-3-butyric acid) in cutting propagation of bean (Phaseolus vulgaris L.), Jack pine (Pinus banksiana Lamb) and Photinia x fraseri has been reported to be equal to or more effective than IBA (1, 2, 3). P-ITB is an attractive alternative to IBA, as a root promoting agent, because of its low phytotoxicity and high LD50 (5000 mg/kg) when compared to IBA (100 mg/kg). This study was initiated to test the effectiveness of P-ITB on the rooting of semihardwood cuttings of Prunus persica (L.) Batsch. 'Redhaven'. Twelve inch (30 cm) terminal, semihardwood cuttings of 'Redhaven' peach were collected on August 1, 1986, wounded on 2 sides of the base, and treated by dipping the base of the stem in a 95% ethanol solution of: 1) IBA, 2) P-ITB, or 3) a 1:1 (by wt) mixture of IBA + P-ITB. Concentrations of IBA or P-ITB rooting aids used were 0, 2000, 4000, and 8000 ppm. In the case of IBA + P-ITB mixture, 50% of the 2000, 4000, and 8000 ppm total conen was IBA; the remaining 50% was P-ITB. Treated cuttings were inserted in 3.5 x 3.5 inch plastic pots filled with No.2 vermiculite; placed under mist on a greenhouse bench and misted continuously for the first 24 hours. For the next 2 weeks, cuttings were misted 4 sec/4 min; thereafter the mist cycle was 4 sec/8 min until termination of the study, 30 days after initiation. The experiment was a randomized complete block; treatments were replicated 3 times with 12 cuttings per replicate. All auxin treated cuttings rooted in higher percentages and developed more roots than corresponding control treatments (Tables 1, 2). Among the auxin treated cuttings, those dipped in IBA or a combination of IBA + P-ITB had a higher percentage rooted and more roots than those cuttings treated with only P-ITB. An optimum concentration for enhanced rooting appears to be either 4000 ppm IBA or 2000 ppm IBA + 2000 ppm P-ITB. P-ITB used alone did not appear to be a satisfactory substitute rooting compound for IBA with peach cuttings. | |
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