Microbiologia Agrícola

URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/190

Navegar

Filtros

20201

Configurações

Assunto: search.filters.subject.MicrobiologiaAssunto: search.filters.subject.BactériasAssunto: search.filters.subject.Filogenia

Resultados da Pesquisa

Agora exibindo 1 - 1 de 1
  • Imagem de Miniatura
    Item
    Taxonomy and phylogeny of mycorrhizal fungi associated with Gomesa recurva (Orchidaceae) and characterization of endophytic bacteria of orchids
    (Universidade Federal de Viçosa, 2020-09-29) Cruz, Everaldo da Silva; Kasuya, Maria Catarina Megumi; http://lattes.cnpq.br/5276773620451113
    Orchids are dependent on an external source of carbon, due to the absence of reserve tissue in their seeds. Thus, in order to obtain carbon and other nutrients, they associate with mutualistic fungi in their root system, which are known as orchidoid mycorrhizal fungi. These fungi are characterized by forming pellets, a set of entwined hyphae inside the roots. In addition, they are able to colonize the embryo cells of the orchid seeds and can remain until the adult stage of the plant. Orchids can associate with other microorganisms such as endophytic bacteria, which can bring several benefits such as growth promotion, due to the production of phytohormones, biological nitrogen fixation, phosphate solubilization, production of siderophores, among others. The objective of this work was (1) to study the taxonomic diversity of mycorrhizal fungi associated with Gomesa recurva (2) to identify and characterize endophytic bacteria associated with Gomesa recurva R. Br. And Zygopetalum maxillare Lodd. By phylogenetic and morphological analyzes, all isolates of G. recurva belong to a new species of Ceratobasidium. Five bacterial isolates were obtained for each species of orchid. By sequencing the 16S rRNA region, it was found that they belonged to the genera Pseudomonas and Paraburkholderia, which, by in vitro tests, showed that they have the capacity to perform biological nitrogen fixation, to produce indole-3-acetic acid phytohormone (AIA) and solubilizing calcium phosphate. The isolates of fungi and bacteria obtained have the potential to be used for the production of orchid seedlings. Keywords: Phylogeny. Fungi. Bacteria. Phytohormones.