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Study of senescence in old cultures of the Bactris gasipaes Kunth in vitro

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Abstract

The in vitro propagation is a technique that is used for the large-scale generation of stable genotypes that are free of disease. Satisfactory propagation has been obtained using Bactris gasipaes Kunth through the direct in vitro regeneration of adventitious buds and somatic embryos, which is likely because of the pluri—and totipotency of the preprocambial cells, which reduces the probability of genetic instability. The consequences of the prolonged period of in vitro cultivation of perennial species such as the peach palm are not clear, as well as the senescence process has only been investigated in species originating from callus structures. The senescence of peach palm clones established and cultivated in vitro for 8 years through direct morphogenic methods (in vitro regeneration of adventitious buds without callus formation) was investigated in the leaves, roots and stem bases using histological, histochemical and ultrastructural analyses, in addition to the TUNEL reaction, to detect programmed cell death. These data from old cultures (8 years cultured) were compared to similar data from plants of the same species that had been established and cultivated in vitro for 1 year (young cultures). These analyses demonstrated the existence of intensive programmed cell death in the various tissues of the old cultures. The in vitro cultivation of peach palm for long periods promoted generalized senescence and probable aging of clones.

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Abbreviations

BAP:

6-Benzylaminopurine

MS:

Murashige and Skoog (1962)

NAA:

1-Naphthaleneacetic acid

PCD:

Programmed cell death

PGR:

Plant growth regulator

PPCs:

Preprocambial cells

TUNEL:

Terminal deoxynucleotidyl transferase dUTP nick end labelling

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Acknowledgments

This work was supported by FAPESP (São Paulo Research Foundation, Brazil), FINEP (Financier of Studies and Projects), Inaceres Agrícola, InVitroPalm (Consulting, Study and Biological Development Ltd.) and CAPES (Coordination for the Improvement of Higher Level, Brazil) supported this study. We thank PhD Edgard Graner, PhD Michelle Agostini, PhD Ricardo Della Coletta, and the Faculty of Dentistry of Piracicaba (State University of Campinas), Piracicaba, São Paulo, Brazil for assistance with the TUNEL reactions. We thank PhD Elliot Watanabe Kitajima, PhD Francisco André Ossamu Tanaka and Renato Barbosa Salaroli of Research Support Centre/Electron Microscopy Applied to Agriculture, “Luiz de Queiroz” College of Agriculture, University of São Paulo (NAP/MEPA/ESALQ/USP), Piracicaba, São Paulo, Brazil for their assistance with the ultrastructural analyses.

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The authors declare that they have no conflict of interest.

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Correspondence to Marcílio de Almeida.

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Graner, E.M., Brondani, G.E., de Almeida, C.V. et al. Study of senescence in old cultures of the Bactris gasipaes Kunth in vitro. Plant Cell Tiss Organ Cult 120, 1169–1189 (2015). https://doi.org/10.1007/s11240-014-0672-4

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  • DOI: https://doi.org/10.1007/s11240-014-0672-4

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