Óleo essencial de <i>Eucalyptus grandis</i> Hill ex Maiden no estímulo à micorrização de mudas de sibipiruna (<i>Caesalpinia peltophoroides </i>Benth.)

Abstract

RESUMOOs metabólitos secundários extraídos de espécies florestais formadoras de ectomicorrizas podem estimular a simbiose entre fungos ectomicorrízicos e espécies florestais nativas do Rio Grande do Sul. O objetivo deste trabalho foi determinar o efeito do óleo essencial de eucalipto na formação de associação ectomicorrízica e no crescimento de mudas de sibipiruna, em condições de casa de vegetação. Plântulas de sibipiruna foram submetidas a quatro tratamentos constituídos pela presença e ausência do inóculo ectomicorrízico Pisolithus microcarpus (Cooke & Massee) e aplicação ou não do óleo essencial de eucalipto. O óleo essencial foi solubilizado e aplicado com pulverizador manual nos períodos de 0, 7 e 14 dias a contar da data de transplante das plântulas. Utilizou-se o delineamento inteiramente casualizado com sete repetições. Decorridos 90 dias de crescimento, as mudas foram coletadas e avaliou-se altura, diâmetro do colo, comprimento de raízes, massa seca da parte aérea e porcentagem de colonização micorrízica. A aplicação do óleo essencial de eucalipto favoreceu a ocorrência de associação ectomicorrízica, com Pisolithus microcarpus em mudas de sibipiruna, proporcionando aumento significativo no desenvolvimento da parte aérea das mudas. Palavras-chave: plantas nativas; Pisolithus microcarpus; metabólitos secundários. ABSTRACTThe 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.

Parapiptadenia rigida MYCORRHIZATION WITH SPORES OF Scleroderma citrinum

“…These results corroborate with Steffen et al (2012), who observed that the application of Eucalyptus grandis essential oil at a concentration of 40 µL . L -1 stimulated the occurrence of ectomycorrhizal association of Pisolithus microcarpus in Caesalpinia peltophoroides Benth.…”

“…the secondary metabolism of the eucalyptus essential oil: Eucalyptol, p-Cymeno, Spathulenol, Lepidozenal, Cubeb-11-ene, Junenol and 4(15)-Dehydroglobulol (STEFFEN et al, 2013) in the substrate contributed to the association between the fungus and the plant due to the occurrence of biochemical signaling (STEFFEN et al, 2012).…”

“…Thus, it is believed that the application of compounds derived from the secondary metabolism of symbiotic plants, such as species of the genus Pinus and Eucalyptus, may be a technological alternative to stimulate the establishment of associations between native forest species in Brazil and ectomycorrhizal fungi, whose symbiosis is quite common in these genera of exotic plants (STEFFEN et al, 2012). Species of the genus Pinus are hosts of S. citrinum (GURGEL et al, 2008) and do not develop normally if they are not associated with ectomycorrhizal fungi (MARTINS et al, 2005).…”

“…According to Raudaskoski and Kothe (2015) this specificity is related to the fungal species dependence on the presence of specific biochemical signals produced by the host plant. There are reports of the positive effect applying secondary metabolites on the mycorrhization of native forest species under controlled conditions (STEFFEN et al, 2012). These results are of interest for the forest sector because of the lack of consensus regarding the occurrence of ectomycorrhizal associations in native Brazilian forest species, being considered rare in natural conditions (OLIVEIRA et al, 2008).…”

Bioestimulação micorrízica com óleo essencial em mudas de Enterolobium contorsiliquum e Bauhinia forficata em solo contaminado com cobre

“…Estudos têm demostrado que os fungos ectomicorrízicos são beneficiados pela presença de óleo essencial de Eucalyptus grandis quando submetidos a metais pesados (STEFFEN et al, 2011), a aplicação do óleo é bioestimulante do crescimento vegetativo de mudas de eucalipto (STEFFEN; ANTONIOLLI; STEFFEN, 2010) e o óleo contribui para a formação de ectomicorriza em mudas de sibipiruna (Caesalpinia peltophoroides Benth.) (STEFFEN et al, 2012). Nas espécies arbóreas nativas como a timbaúva-preta (Enterolobium contortisiliquum Vell.)…”