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New insights into the in vitro organogenesis process: the case of Passiflora

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Abstract

We present evidences that ultrastructural electron microscope findings are valuable ways to understand the in vitro regeneration process, in particular in the yellow passion fruit. Shoot-regeneration was induced in hypocotyl and leaf-derived explants using 4.44 μM BAP, and the entire organogenic process was analyzed using conventional histology, scanning and transmission electronic microscopy. Both direct and indirect regeneration modes were observed in hypocotyl explants, but only direct regeneration occurred in leaf-derived cultures. In the direct pathway from both explant types, meristemoids developed into globular structures, here called protuberances. The peripheral meristematic layers of the protuberances displayed ultrastructural characteristics indicative of a high metabolic activity, and only these cells originated shoots and leaf primordia, the latter being frequent when leaf explants were used. Moreover, the peripheral cells of the protuberances derived from leaf explants lost adhesion during the culture, diminishing the regeneration rates. We recommend the use of hypocotyls as a source of explant to obtain shoots as well as a genetic transformation system for the yellow passion fruit. However, the direct pathway is preferred because a type of amitosis occurred in the peripheral cells of hypocotyl-derived calli, which has the potential to result in genetic instability of the regenerating plants/tissue.

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Abbreviations

BAP N6 :

6-Benzylaminopurine

TDZ:

Thidiazuron (N-phenyl-N′-1,2,3,-thiadiazol-5-ylurea)

SEM:

Scanning electron microscopy

TEM:

Transmission electron microscopy

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Acknowledgments

We are grateful to the Institutions Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Pesquisa (CNPq) for financial support. Professor Elliot W. Kitajima from the Microscopic Center, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, and Professor Elisa A. Gregório from the Microscopic Center, Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho” for the use of laboratory facilities.

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Authors and Affiliations

  1. Universidade Estadual de Campinas, Instituto de Biologia, Campinas, Brazil

    Juliana A. Fernando

  2. Universidade de São Paulo, Escola Superior de Agricultura “Luiz de Queiroz”, P.O. Box 9, Piracicaba , 13418-900, Brazil

    Maria Lúcia C. Vieira & Beatriz Appezzato-da-Glória

  3. Universidade Estadual Paulista, Instituto de Biociências, Botucatu, Brazil

    Silvia R. Machado

Authors
  1. Juliana A. Fernando
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  2. Maria Lúcia C. Vieira
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  3. Silvia R. Machado
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  4. Beatriz Appezzato-da-Glória
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Correspondence to Beatriz Appezzato-da-Glória.

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Fernando, J.A., Vieira, M.L.C., Machado, S.R. et al. New insights into the in vitro organogenesis process: the case of Passiflora . Plant Cell Tiss Organ Cult 91, 37–44 (2007). https://doi.org/10.1007/s11240-007-9275-7

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  • DOI: https://doi.org/10.1007/s11240-007-9275-7

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