Estaquia caulinar de Rubus erythrocladus Mart. ex Hook.f em diferentes concentrações de ácido indolbutírico

The shrub Rubus erythrocladus Mart. ex Hook.f. (green blackberry) is endemic species to Brazil and one of the unconventional food plants, which has great potential for use due to the pleasant taste of its fruits and the high concentrations of flavonoids. The objective of this study was to evaluate the effect of different IBA concentrations on rooting of R. erythrocladus stem cuttings. The experiment was carried out under greenhouse at IFRS - Campus Sertao, from November 2018 to January 2019. The experimental design was completely randomized with six concentrations (0, 500, 1,000, 2,000, 3,000, 4,000 mg L-1) IBA, with five cuttings per experimental unit and four replications, totaling 120 cuttings. The percentage of survival and rooting of the cuttings, the number of roots and the length of the largest root were evaluated after 60 days of the implementation of the experiment. Data were analyzed by analysis of variance and means compared by Tukey test (α = 0.05). The number of roots and the length of the largest root were evaluated using descriptive statistics (mean and standard deviation). Cuttings treated with IBA at concentration 1000 mg L-1 showed higher survival and rooting (60%), higher number of roots (2.8 ± 2.6) and length of the largest root (6.5 ± 2.5 cm), differing statistically from other treatments. It is possible to propagate R. erythrocladus by cutting. The application of IBA at a concentration of 1,000 mg L-1 was the best treatment for stem cuttings rhizogenesis.