Resumo

RIVERO MALDONADO, G.; RAMIREZ, M.; CARABALLO, B.  e  GUERRERO, R.. Enraizamiento de estacas de semeruco (Malpighia emarginata Sessé & Moc. ex DC). Rev. Fac. Agron. [online]. 2005, vol.22, n.2, pp.130-142. ISSN 0378-7818.

Abstract This research was carried out with the purpose of establishing a vegetative propagation methodology to multiply selections of Malpighia emarginata. The objectives were: 1) to evaluate the rooting of apical cuttings under the following rooting media: sugarcane rum + organic manure from river bank (S1); worm humus + organic matter from river bank (S2); coconut shell + organic manure from river bank (S3); top soil + organic manure from river bank (S4); and the application or not of indole butyric acid (AIB) at 5000 mg kg^-1, and 2) to determine the primordial rooting on cuttings treated or non treated with AIB. It was used a completely randomized design using five replications treatment^-1. The experimental unit was five stakes for the first objective and 10 stakes for the second objective. The following variables were measured 60 days after the treatments of rooting: percentage (%) of alive stakes (PV), percentage (%) of rooting (PE), percentage (%) of primordial root (PP), root number (NR) and root length (LR). Microscope observations were done weekly to follow the primordial growth on five stakes. The results showed significant differences between the substrates (P<0.01), S1 induced the best rooting considering PE and LR (47.5 and 5.02 cm, respectively); AIB affected PE, NR, and LR when treated with AIB were of 37.5%, 1.91 roots stakes^-1 and 4.22 cm respectively in comparison with no treatment of AIB that were of 23.75%, 0.59 roots cutting^-1 and 2.06 cm (P<0.01). The primordium roots were favored by the AIB treatment at 5000 mg kg^-1, shortening their development in two weeks; a mean of 1.5 primordium roots stakes^-1 was obtained. Other rooting substrates and levels of AIB need to be evaluated for these plant specie.

Palavras-chave : Malpighia emarginata; cuttings; substrates; indolbutiric acid; primordial roots.