Rooting of stem cuttings of <i>Allamanda cathartica</i> L treated with indolbuthyric acid (IBA)

Abstract

The objective of this study was to evaluate the effect of three auxin concentrations (0, 4000 and 8000 ppm), Indolbuthyric acid (IBA), to induce the formation of adventitious roots in three types of stem cuttings (herbaceous, woody and semi-woody) of alamanda (Allamanda cathartica L.). The cuttings
were collected from plants in the UFRRJ area, cut into bezel, with approximately, 15 cm long, treated with the fungicide Benomyl and later with IBA. The experimental design was in randomized blocks with three treatments (0, 4000 and 8000 ppm of IBA) and three repetitions. The assessments were made weekly (each week being considered a period of evaluation) and at the end of 30 days after planting, observing the appearance or absence of calluses, roots and shoots. Statistical differences were observed for the evaluation period, standing up the treatment with 8000 ppm of IBA, with the best results in the three appraised periods. Among the stakes, the semi-woody and woody ones, in the treatment with 8000 ppm of IBA, presented the best results for the formation of calluses, roots and shoots. The results showed that the IBA acid influences in the rooting of alamanda stem cuttings.