ENRAIZAMENTO DE ESTACAS DE Jasminum polyanthum TRATADAS COM ÁCIDO INDOLBUTÍRICO ROOTING OF Jasminum polyanthum CUTTINGS TREATED WITH INDOLEBUTYRIC ACID

-1 de IBA. Apos os tratamentos, as estacas foram plantadas em tubetes contendo vermiculita de granulometria media e mantidas em casa de vegetacao com nebulizacao intermitente por 54 dias. As variaveis analisadas foram: porcentagem de estacas enraizadas, numero de raizes formadas por estaca, comprimento de raizes formadas por estaca, porcentagem de estacas com calos, porcentagem de estacas vivas e porcentagem de estacas mortas. Nao houve diferenca significativa entre os diversos tratamentos para as variaveis estacas com calos, comprimento de raizes e numero de raizes por estaca. Com relacao ao enraizamento, a ausencia da aplicacao de IBA em solucao ou talco (testemunha) apresentou resultados satisfatorios na porcentagem de estacas enraizadas (80%), comprimento de raizes (3,46 e 3,66 cm respectivamente) e numero de raizes por estaca (5,55 e 4,95 respectivamente), sendo dispensavel a aplicacao de IBA para promover o enraizamento nesta especie. Palavras-chave: Jasmim dos poetas, estaquia, regulador vegetal, auxina. ABSTRACT Poet's jasmine (Jasminum polyanthum) is a species widely used is ornamental landscaping. But little research was been done on the efficiency of propagaton of this species. This study aimed to evaluate the rooting of stem, 8 cm in length Jasminum polyanthum treated with different concentrations of butyric acid (IBA) by the powder and water-alcohol solution at concentrations of 0, 1000, 1500 and 3000 mg L -1 or mg kg-1 of IBA. After the treatments, the cuttings were planted in tubes containing vermiculite and maintained an average particle size in a greenhouse with intermittent mist for 54 days. The variables were: rooting percentage, number of roots per cutting, root length per cutting, percentage of cuttings with callus, percentage of live cuttings and percentage of dead cuttings. Significant difference was not found between treatments for the variables cuttings with callus, root length and root number per cutting. In relation to rooting, the absense of application of IBA in talc or solution (control) showed satisfactory results in rooting percentage (80%), root length (3.46 and 3.66 cm respectively) and number of roots per cuttings (5.55 and 4.95 respectively), being dispensable the application of IBA to promote rooting in this species.