Plant Cell, Tissue and Organ Culture (PCTOC)

, Volume 111, Issue 1, pp 69–78 | Cite as

Anatomical and ultrastructural analyses of in vitro organogenesis from root explants of commercial passion fruit (Passiflora edulis Sims)

  • Diego Ismael Rocha
  • Lorena Melo Vieira
  • Francisco André Ossamu Tanaka
  • Luzimar Campos da Silva
  • Wagner Campos Otoni
Original Paper


This study aimed to characterize the anatomical events and ultrastructural aspects of direct and indirect in vitro organogenesis in Passiflora edulis. Root explants were cultured on induction medium, supplemented with 4.44 μM 6-benzyladenine. Roots at different stages of development were collected and processed for observation by light microscopy and scanning and transmission electron microscopy. Patterns of direct and indirect regeneration were observed in the explants. During direct organogenesis, the organogenic buds and nodules, formed from meristemoids, originated from the pericycle regions distant from the cut surface. Completely differentiated buds were observed after 20 days of culture. During indirect organogenesis, bud formation occurred via meristemoids at the periphery of the calli, which differentiated from the cortical region of the initial explant. Regardless of the regeneration pattern, the meristemoids had similar ultrastructural characteristics; however, differences were reported in the nuclear shape of the cells of the meristemoids formed directly and indirectly. This study provides important information for enhancing the understanding and characterization of the organogenic process in non-meristematic explants and provides information on the use of roots as explants in genetic transformation protocols for this important tropical species.


Histology Meristemoids Passiflora Pericycle Root culture Shoot regeneration 


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Diego Ismael Rocha
    • 1
  • Lorena Melo Vieira
    • 1
  • Francisco André Ossamu Tanaka
    • 2
  • Luzimar Campos da Silva
    • 3
  • Wagner Campos Otoni
    • 1
  1. 1.Plant Tissue Culture Laboratory/BIOAGRO, Plant Biology DepartmentFederal University of ViçosaViçosaBrazil
  2. 2.Plant Pathology and Nematology DepartmentResearch Support Center/Electron Microscopy Applied to Agriculture, University of São PauloPiracicabaBrazil
  3. 3.Plant Anatomy Laboratory, Plant Biology DepartmentFederal University of ViçosaViçosaBrazil

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