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Rooting of apical cuttings of Angelonia integerrima Sprengel: concentrations of indole-3-butyric acid and substrates

The objective of this study was to evaluate the effect of the concentration of indole-3-butyric acid (IBA) and substrates in the rooting of apical cuttings of Angelonia integerrima. Powder IBA was used at the concentrations 0, 500, 1,000, 2,000 and 4,000 mg kg-1, and two substrates containing carbonized rice husks (CRH) and commercial substrate based on Sphagnum peat were used. The number of rooted cuttings, shoot length, root system length, number of new leaves, root system volume, callus formation at the cutting base, and shoot and root dry matter were evaluated. The experimental design was completely randomized with a factorial design (5 IBA concentrations x 2 substrates). There were no interactions between the concentrations of IBA and the substrates. There was a difference only for the factor substrate. The cuttings presented an average rooting of 79%, with callus formation in 59.4% of them. The CRH substrate presented the highest shoot length and the highest number of new leaves. The commercial substrate resulted in a high average root volume, a large root length and a great increase in root dry matter. In the rooting by cutting of A. integerrima is not necessary to use IBA and the commercial substratum based on peat or CRH can be used.