Época de coleta e ácido indolbutírico no enraizamento de estacas de espirradeira (Nerium oleander L.)
Carregando...
Data
2012-02-01
Autores
Pivetta, Kathia Fernandes Lopes [UNESP]
Pedrinho, Denise Renata
Fávero, Silvio
Batista, Gisele Sales [UNESP]
Mazzini, Renata Bachin [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade de Investigações Florestais
Resumo
A espirradeira (Nerium oleander L.) é uma importante espécie arbórea ornamental, muito utilizada no meio urbano. É propagada por estacas, porém a porcentagem de enraizamento é baixa e não há estudos sobre fatores que influenciam nesse processo. Este trabalho teve, portanto, o objetivo de estudar o efeito da época de coleta e do ácido indolbutírico (AIB) no enraizamento de estacas de duas variedades de espirradeira (Nerium oleander L.), determinadas pela coloração das flores (rosa e branca). O experimento foi instalado na UNESP, Campus de Jaboticabal/SP, no verão e no inverno. O delineamento experimental foi em blocos casualizados em esquema fatorial 2 x 2 x 4 (duas variedades combinadas com duas estações do ano e quatro concentrações de AIB - 0, 1.000, 2.000 e 4.000 mg kg-1). As avaliações foram realizadas 60 dias após a estaquia, sendo estas as variáveis: porcentagem de enraizamento, número médio, comprimento e massa de matéria seca de raízes. Concluiu-se que o enraizamento de ambas as variedades de espirradeira (rosa e branca) foi superior no verão. A variedade de flores rosas apresentou maior número e comprimento médio de raízes no verão, porém as maiores porcentagens de enraizamento e massa de matéria seca de raízes foram encontradas no inverno. O ácido indolbutírico foi efetivo para aumentar a porcentagem de enraizamento nas concentrações testadas de 1.000 e 2.000 mg kg-1; maior número, comprimento e massa de matéria seca de raízes foram obtidos na concentração de 2.000 mg kg-1.
Nerium oleander plants are important ornamental trees, much cultivated in urban centers. This species is propagated by cuttings, but rooting percentage is very low and there are no studies on the factors that influence this process. Therefore, the objective of this work was to study the effect of the harvesting time and the indolebutyric acid (IBA) on the rooting of cuttings of two Nerium oleander varieties, determined by flower color (pink and white). The experiments were conducted at UNESP, Campus of Jaboticabal, São Paulo State, Brazil, during summer and winter. The experimental design was in randomized blocks and the treatments were organized in a 2 x 2 x 4 factorial arrangement (two varieties, two harvesting times and four IBA concentrations - 0, 1000, 2000 and 4000 mg kg-1). The evaluations were done 60 days after the cuttings, and the following variables were observed: percentage of rooting, mean root number, mean root length and mean root dry mass. Rooting of the two varieties was higher in summer (97%) when compared to winter (77% and 56% respectively for the pink variety showed higher rooting percentage and root dry mass in winter and higher number and length of roots in summer; the indolebutyric acid concentrations of 1000 and 2000 mg kg-1 increased the rooting percentage, and the 2000 mg kg-1 one increased root number, root length and root dry mass.
Nerium oleander plants are important ornamental trees, much cultivated in urban centers. This species is propagated by cuttings, but rooting percentage is very low and there are no studies on the factors that influence this process. Therefore, the objective of this work was to study the effect of the harvesting time and the indolebutyric acid (IBA) on the rooting of cuttings of two Nerium oleander varieties, determined by flower color (pink and white). The experiments were conducted at UNESP, Campus of Jaboticabal, São Paulo State, Brazil, during summer and winter. The experimental design was in randomized blocks and the treatments were organized in a 2 x 2 x 4 factorial arrangement (two varieties, two harvesting times and four IBA concentrations - 0, 1000, 2000 and 4000 mg kg-1). The evaluations were done 60 days after the cuttings, and the following variables were observed: percentage of rooting, mean root number, mean root length and mean root dry mass. Rooting of the two varieties was higher in summer (97%) when compared to winter (77% and 56% respectively for the pink variety showed higher rooting percentage and root dry mass in winter and higher number and length of roots in summer; the indolebutyric acid concentrations of 1000 and 2000 mg kg-1 increased the rooting percentage, and the 2000 mg kg-1 one increased root number, root length and root dry mass.
Descrição
Palavras-chave
Estaquia, AIB e Propagação assexuada, cuttings, IBA and Asexual propagation
Como citar
Revista Árvore. Sociedade de Investigações Florestais, v. 36, n. 1, p. 17-23, 2012.