Enraizamento de estacas de Ginkgo biloba tratadas com ácido indolbutírico e ácido bórico

Abstract

RESUMOObjetivou-se neste trabalho estudar o efeito do ácido indolbutírico (AIB) e do ácido bórico (B) no enraizamento de estacas de Ginkgo biloba. Em estacas com duas folhas, medindo 15 cm de comprimento foram provocadas duas lesões na base de aproximadamente 2 cm, expondo o câmbio e procedeu-se à imersão por 10 segundos no tratamento correspondente, AIB (0, 1000, 2000 e 3000 mg L Termos para indexação: Auxinas, Ginkgo biloba, propagação vegetativa. ABSTRACTThe aim of the work was to study the effect of indolbutyric (IBA) and boric (B) acids to root Ginkgo biloba cuttings. At the base of cuttings, with two leaves and 15 cm of length, were made two lesions with 2 cm to expose the cambium. Cuttings were treated for a period of 10 seconds with four concentrations of IBA (0, 1000, 2000 and 3000 mg L -1 ) combined with two concentration of B (0 and 150 mg L -1 ). After that, cuttings were taken in polypropylene trays filled with washed sand. The experimental design was of randomized blocks in the factorial arrangement (4x2), with six replications. After 70 days, evaluations were done considering rooted, non-rooted, and dead cuttings, diameter and length of the roots. The data were submitted to ANOVA and previously tested for normality by the Shapiro-Wilk Test. Rooting with IBA at 2000 mg L -1 (80,55%) was better than IBA at zero mg L -1 (55,56%), not differing from the other treatments. Boric acid (B) at 150 µg mL -1 didn t increase rooting rate, and dead cuttings. There was no interaction between IBA and B concentrations. No effect of IBA or B in the diameter and the length of roots was observed.

Rooting of azalea cuttings of Otto and Terra Nova cultivars treated with auxin and boron

“…The same authors also support another factor that may have favored this result, which is the leaf presence in the cuttings, since they continue the process of production and supply of carbohydrates used in the rhizogenic process. Similar results were found by Valmorbida and Lessa (2008), who also observed that there was no effect of IBA and boron on rooting percentage of ginkgo tree cuttings (Ginkgo biloba). Furthermore, for the same azalea genus, Salvador, Jadoski and Resende (2005) observed that there was no effect of IBA on rooting percentage of Rhododendron indicum cuttings.…”

Ácido indolbutírico na propagação vegetativa de alecrim

“…Trabalhos conduzidos por Scalon et al (2003), testando o efeito dos tratamentos água, ácido indol acético (ANA), ANA+boro, AIB, AIB + boro e boro no enraizamento de estacas de alecrim, constataram que o comprimento da maior raiz (11,5 cm) foi obtido com AIB (250 mg/L) + boro (100 mg/L), no mês de agosto. O boro adicionado à auxina tem como função proporcionar aumento na formação e crescimento das raízes (Valmorbida & Lessa, 2008).…”

Efeito de substratos e boro no enraizamento de estacas de pitaya

“…Contudo, algumas espécies como kiwi (Ono et al, 1995), Platanus acerifolia (Nicoloso et al, 1999) e Ginkgo biloba (Valmorbida & Lessa, 2008) têm pequena resposta ou não respondem à aplicação de boro isolado e/ou em conjunto com reguladores vegetais auxínicos no que tange ao desenvolvimento radicular.…”