Efeitos de auxinas e boro no enraizamento de estacas caulinares de louro (Laurus nobilis L.)
Data
2001-12
Autores
Herrera, Tatiana Isabel Reategui [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O presente trabalho teve como objetivo estudar o efeito de ácido indolbutírico (IBA) no enraizamento de estacas apicais de louro (Laurus nobilis L.) aplicado sozinho ou em conjunto com ácido bórico, em câmara de nebulização com temperatura e umidade controladas. As estacas foram coletadas de ramos jovens (mais externos) de louro, no dia 14 de fevereiro de 2001 entre 7:00 e 9:00 horas da manhã e transportadas ao Laboratório de Fisiologia Vegetal do Departamento de Botânica, do Instituto de Biociências – UNESP, onde procedeu-se ao preparo das mesmas. Dos ramos foram retiradas estacas apicais mantendo-se apenas duas folhas na parte superior, sendo o comprimento de 15cm. Após o preparo das estacas, estas receberam diferentes concentrações de ácido indol-butírico (IBA) a 0, 50, 150 e 300mg.L-1, misturado ou não com boro 150mg.mL-1, onde as suas bases permaneceram imersas por 24 horas. Logo após os tratamentos, as estacas foram colocadas em bandejas de isopor contendo como substrato, casca de arroz carbonizada e mantidas sob nebulização. A coleta das estacas foi realizada 70 dias após a instalação, onde foram avaliadas a porcentagem de estacas enraizadas, porcentagem de estacas com calo, porcentagem de estacas vivas, porcentagem de estacas mortas, número de raízes formadas e comprimento das raízes. Os resultados obtidos mostraram que, o IBA 50mg.L-1 proporcionou a maior porcentagem de estacas enraizadas (54,17%). A adição de boro aos tratamentos auxínicos levou a maior porcentagem de estacas com calos e menor porcentagem de estacas mortas. O tratamento com IBA 50mg.L-1 + boro proporcionou o maior número de raízes nas estacas (10,12) e maior comprimento dessas raízes (46,57mm).
The purpose of this study was to evaluate the effect of the indolebutyric acid (IBA) on laurel (Laurus nobilis L.) stem cuttings rooting applied with or without boric acid, carried within greenhouse with mist, on controlled temperature and humidity. The cuttings was obtained as harvest of laurel plants, in February, 14, in the between at 7:00 and 9:00 hours, and transported for the Plant Physiology Laboratory from Department of Botany of Institute of Bioscience - UNESP where was preceded the preparation of cuttings. The cuttings was taked of apical portion and leaving two leaves by the up-side. The cuttings’ lenght was 15cm. The cuttings were treated with indole-butyric acid (IBA) at 0, 50, 150 and 300mg.L-1 with or without 150mg.mL-1 of boron, where 1cm of the cutting base was immersed for 24 hours. After the treatments, the cuttings were put in styrofoam trays with carbonized rice hull and maintained on intermittent mist during 70 days when was evaluated the rooting percentage, stem cuttings with callus percentage, live cuttings percentage, dead cuttings percentage, roots number and roots length. The results showed that IBA 50mg.L-1 enhanced the rooting percentage (54,17%). Auxins treatments with boron enhanced the stem cuttings with callus percentage and lower dead cuttings percentage. The treatments with IBA 50mg.L-1 + boron showed the higher root number in stem cuttings (10,12) and higher length of this roots (46,57mm).
The purpose of this study was to evaluate the effect of the indolebutyric acid (IBA) on laurel (Laurus nobilis L.) stem cuttings rooting applied with or without boric acid, carried within greenhouse with mist, on controlled temperature and humidity. The cuttings was obtained as harvest of laurel plants, in February, 14, in the between at 7:00 and 9:00 hours, and transported for the Plant Physiology Laboratory from Department of Botany of Institute of Bioscience - UNESP where was preceded the preparation of cuttings. The cuttings was taked of apical portion and leaving two leaves by the up-side. The cuttings’ lenght was 15cm. The cuttings were treated with indole-butyric acid (IBA) at 0, 50, 150 and 300mg.L-1 with or without 150mg.mL-1 of boron, where 1cm of the cutting base was immersed for 24 hours. After the treatments, the cuttings were put in styrofoam trays with carbonized rice hull and maintained on intermittent mist during 70 days when was evaluated the rooting percentage, stem cuttings with callus percentage, live cuttings percentage, dead cuttings percentage, roots number and roots length. The results showed that IBA 50mg.L-1 enhanced the rooting percentage (54,17%). Auxins treatments with boron enhanced the stem cuttings with callus percentage and lower dead cuttings percentage. The treatments with IBA 50mg.L-1 + boron showed the higher root number in stem cuttings (10,12) and higher length of this roots (46,57mm).
Descrição
Palavras-chave
Plantas - Propagação por estaquia, Reguladores de crescimento, Boron, Laurus nobilis L
Como citar
HERRERA, Tatiana Isabel Reategui. Efeitos de auxinas e boro no enraizamento de estacas caulinares de louro (Laurus nobilis L.). 2001. xiii, 59 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, 2001.