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Structural interaction between GFP-labeled diazotrophic endophytic bacterium Herbaspirillum seropedicae RAM10 and pineapple plantlets 'Vitória'
Baldotto, Lílian Estrela Borges; Olivares, Fábio Lopes; Bressan-Smith, Ricardo.
  • Baldotto, Lílian Estrela Borges; Universidade Federal de Viçosa. Campus de Florestal. BR
  • Olivares, Fábio Lopes; Universidade Estadual do Norte Fluminense Darcy Ribeiro. Centro de Biociências e Biotecnologia. Laboratório de Biologia Celular e Tecidual. BR
  • Bressan-Smith, Ricardo; Universidade Estadual do Norte Fluminense Darcy Ribeiro. Centro de Ciências e Tecnologias Agropecuárias. Laboratório de Melhoramento Genético Vegetal. BR
Braz. j. microbiol ; 42(1): 114-125, Jan.-Mar. 2011. ilus
Article in English | LILACS | ID: lil-571382
Responsible library: BR32.1
ABSTRACT
The events involved in the structural interaction between the diazotrophic endophytic bacterium Herbaspirillum seropedicae, strain RAM10, labeled with green fluorescent protein, and pineapple plantlets 'Vitória' were evaluated by means of bright-field and fluorescence microscopy, combined with scanning electron microscopy for 28 days after inoculation. After 6 hours of inoculation, H. seropedicae was already adhered to the roots, colonizing mainly root hair surface and bases, followed by epidermal cell wall junctions. Bacteria adherence in the initial periods occurred mainly in the form of solitary cells and small aggregates with pleomorphic cells. Bacteria infection of root tissue occurred through the cavities caused by the disruption of epidermal cells during the emergence of lateral roots and the endophytic establishment by the colonization of intercellular spaces of the cortical parenchyma. Moreover, within 1 day after inoculation the bacteria were colonizing the shoots. In this region, the preferred sites of epiphytic colonization were epidermal cell wall junctions, peltate scutiform trichomes and non-glandular trichomes. Subsequently, the bacteria occupied the outer periclinal walls of epidermal cells and stomata. The penetration into the shoot occurred passively through stoma aperture followed by the endophytic establishment on the substomatal chambers and spread to the intercellular spaces of spongy chlorenchyma. After 21 days of inoculation, bacterial biofilm were seen at the root hair base and on epidermal cell wall surface of root and leaf, also confirming the epiphytic nature of H. seropedicae.
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Full text: Available Index: LILACS (Americas) Main subject: In Vitro Techniques / Microscopy, Electron / Cell Wall / Biofilms / Ananas / Herbaspirillum / Green Fluorescent Proteins / Nitrogen Fixation Language: English Journal: Braz. j. microbiol Journal subject: Microbiology Year: 2011 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Estadual do Norte Fluminense Darcy Ribeiro/BR / Universidade Federal de Viçosa/BR

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Full text: Available Index: LILACS (Americas) Main subject: In Vitro Techniques / Microscopy, Electron / Cell Wall / Biofilms / Ananas / Herbaspirillum / Green Fluorescent Proteins / Nitrogen Fixation Language: English Journal: Braz. j. microbiol Journal subject: Microbiology Year: 2011 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Estadual do Norte Fluminense Darcy Ribeiro/BR / Universidade Federal de Viçosa/BR