Substratos, concentrações de ácido indolbutírico e tipos de miniestacas no enraizamento de melaleuca (Melaleuca alternifolia Cheel)

Abstract

RESUMO:Melaleuca alternifolia tem como produto principal o óleo essencial extraído das folhas devido às propriedades antifúngicas e antibacterianas. Pouco se tem relatado sobre a propagação desta espécie, sendo a miniestaquia uma alternativa para a propagação vegetativa de clones superiores visando à implantação de campo de produção. ), em dois tipos de miniestacas (apical e mediana). As miniestacas foram confeccionadas com 5 cm de comprimento, mantidas em casa de vegetação com nebulização intermitente, e, após 45 dias do plantio, foram avaliadas as porcentagens de miniestacas enraizadas, com calos e não responsivas, o número de raízes formadas por miniestaca e o comprimento das três maiores raízes (cm). O substrato Golden-Mix ® e as miniestacas coletadas da porção apical do ramo submetidas ao tratamento com 500 mg L -1 de AIB apresentaram maior porcentagem de enraizamento e melhor qualidade do sistema radicial. Palavras-chave:Myrtaceae, auxina, óleo essencial, plantas medicinais, propagação vegetativa ABSTRACT: Substrates, indolebutyric acid levels and types of minicuttings on the rooting of tea tree (Melaleuca alternifolia Cheel). Melaleuca alternifolia has as major product the essential oil extracted from its leaves due to its antifungal and antibacterial properties. There are scarce reports about the propagation of this species, and minicutting is an alternative for vegetative propagation of superior clones in order to establish a production field. This study aimed to evaluate the effect of different substrates, IBA levels and types of minicuttings on the rooting of Melaleuca alternifolia. In the first experiment, the following substrates were tested: medium sand, Plantmax HT ® , Golden-Mix ® and vermiculite. In the second experiment, different IBA levels (0, 500, 1000 and 2000 mg L -1 ) were tested for two minicutting types (apical and medium). Minicuttings were prepared with 5 cm length and were kept in a greenhouse with intermittent mist; then, at 45 days after planting, we evaluated: the percentages of rooted minicuttings, with callus and non-responsive, the number of roots per minicutting and the length of the three longest roots. The substrate Golden-Mix ® and the minicuttings collected from the apical part of the branch and treated with 500 mg L -1 IBA presented the largest rooting percentage and the best root system quality.

Indolebutyric acid in “pulse” treatment on the rooting of Luehea divaricata minicuttings

“…Thus, as previously mentioned, the concentration of 4000 mg L -1 produced significantly improved results for the number and length of the roots; however, since the lower concentration (1000 mg L -1 ) did not yield significantly different results from those with the highest concentration, it is more economically viable to apply a smaller amount of phytoregulator to the base of the minicuttings of Luehea divaricata. A similar result to the one obtained in the present study was observed with Melaleuca alternifolia, which presented an average root length of 10.47 cm with the use of a higher concentration of IBA at 2000 mg L -1 (OLIVEIRA et al, 2012). In the minicuttings of Handroanthus heptaphyllus, a shorter average root length than that observed in this study was obtained (4.47 cm) by applying a much higher concentration (8000 mg L -1 ) of IBA (OLIVEIRA, et al, 2016).…”

Effect of the hydrogel incorporation on different substrates on the rooting and quality of clonal Eucalyptus seedlings

“…This is an indication that root formation occurred in these seedlings even after 35 DAC, thus allowing the seedling to complete its development. Callus and roots formation are independent processes in most plants (GOULART et al, 2014), but in some of them, callus formation can be a precursor to the formation of adventitious roots (GOULART et al, 2014;OLIVEIRA et al, 2012). For., Piracicaba, v. 47, n. 122, p. 336-345 In species with difficult rooting, the substrate can influence both the rooting percentage and the quality of the formed root system (XAVIER; WENDLING; SILVA, 2009).…”

MINI-CUTTING TECHNIQUE FOR VEGETATIVE PROPAGATION OF Paratecoma peroba

“…The types of mini-cutting did not influence the rooting of Handroanthus heptaphyllus (Freitas et al, 2016) and Toona ciliata (Ferreira et al, 2012). Yet, in Anadenanthera macrocarpa (Dias et al, 2015), Melaleuca alternifolia (Oliveira et al, 2012), and Peltophorum dubium (Mantovani et al, 2017) apical mini-cuttings were superior for rooting.…”