ESSENTIAL OIL OF Eucalyptus grandis Hill ex Maiden IN STIMULATING MYCORRHIZAL SIBIPIRUNA SEEDLINGS ( Caesalpinia peltophoroides Benth.)

Abstract

Os metab\uf3litos secund\ue1rios extra\ueddos de esp\ue9cies florestais formadoras de ectomicorrizas podem estimular a simbiose entre fungos ectomicorr\uedzicos e esp\ue9cies florestais nativas do Rio Grande do Sul. O objetivo deste trabalho foi determinar o efeito do \uf3leo essencial de eucalipto na forma\ue7\ue3o de associa\ue7\ue3o ectomicorr\uedzica e no crescimento de mudas de sibipiruna, em condi\ue7\uf5es de casa de vegeta\ue7\ue3o. Pl\ue2ntulas de sibipiruna foram submetidas a quatro tratamentos constitu\ueddos pela presen\ue7a e aus\ueancia do in\uf3culo ectomicorr\uedzico Pisolithus microcarpus (Cooke & Massee) e aplica\ue7\ue3o ou n\ue3o do \uf3leo essencial de eucalipto. O \uf3leo essencial foi solubilizado e aplicado com pulverizador manual nos per\uedodos de 0, 7 e 14 dias a contar da data de transplante das pl\ue2ntulas. Utilizou-se o delineamento inteiramente casualizado com sete repeti\ue7\uf5es. Decorridos 90 dias de crescimento, as mudas foram coletadas e avaliou-se altura, di\ue2metro do colo, comprimento de ra\uedzes, massa seca da parte a\ue9rea e porcentagem de coloniza\ue7\ue3o micorr\uedzica. A aplica\ue7\ue3o do \uf3leo essencial de eucalipto favoreceu a ocorr\ueancia de associa\ue7\ue3o ectomicorr\uedzica, com Pisolithus microcarpus em mudas de sibipiruna, proporcionando aumento significativo no desenvolvimento da parte a\ue9rea das mudas.The secondary metabolites extracted from forest species forming ectomycorrhizal could stimulate the symbiosis between ectomycorrhizal fungi and natives forest species of Rio Grande do Sul state. The aim of this work was to evaluate ectomycorrhizal association and the seedlings growth of inoculated and non-inoculated Sibipiruna with Pisolithus microcarpus (Cooke & Massee) ectomycorrhizal fungus and submitted and not submitted to the application of the essential oil of Eucalyptus grandis , in greenhouse conditions. The essential oil was solubilized and applied with manual spray during periods of 0, 7 and 14 days from the date of seedlings transplanting. A randomized design with seven repetitions was used. After 90 days of plant growth, it was evaluated the seedling colonization degree, the height, the stem diameter, the root length and the dry mass of shoots. The eucalyptus essential oil stimulates the occurrence of ectomycorrhizal on Sibipiruna seedlings, thus providing high seedling development when inoculated with Pisolithus microcarpus