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DNA methylation during sexual embryogenesis and implications on the induction of somatic embryogenesis in Castanea sativa Miller

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Abstract

From anthesis to mature seed formation, burrs from cross-pollinated adult Castanea sativa Miller trees were characterized and seven developmental stages defined based on macro and micromorphological traits. In order to get an insight into the involvement of epigenetic mechanisms in sexual embryogenesis and to define somatic embryogenesis induction capability, global DNA methylation and the somatic embryogenic competence were quantified. On cross-pollinated trees once fertilization takes place, at least one ovule per ovary becomes dominant, and transient DNA demethylation occurs coinciding with the start of the sexual embryogenic programme. Unfertilized ovules from the same cluster, which maintain their prior size, increase their methylation level and undergo degeneration. These results were validated using non-cross-pollinated trees and the asynchrony of flower receptivity. When testing in vitro somatic embryogenesis response of isolated dominant ovules and axes from zygotic embryos under cross-pollinated conditions, the highest competence was found for reaching seed maturity. Thus, a “developmental window” of somatic embryogenesis in chestnut has been characterized. It includes from fertilization to embryo maturity, and a transient decrease in methylation is necessary after fertilization for the development of the somatic embryogenesis response.

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Authors and Affiliations

  1. Dpto. Biología de, Organismos y Sistemas, Área de Fisiología Vegetal, Universidad de Oviedo, Ed. Santiago Gascón, Oviedo, España

    M. Viejo, R. Rodríguez, L. Valledor, M. Pérez & M. J. Cañal

  2. Instituto, Universitario de Biotecnología de Asturias (IUBA), Universidad de Oviedo, Ed. Santiago Gascón, Oviedo, España

    M. Viejo, R. Rodríguez, L. Valledor, M. Pérez & M. J. Cañal

  3. Centro de Biotecnología, Universidad de Concepción, Concepción, Chile

    R. Hasbún

Authors
  1. M. Viejo
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  2. R. Rodríguez
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  3. L. Valledor
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  4. M. Pérez
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  5. M. J. Cañal
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  6. R. Hasbún
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Corresponding author

Correspondence to M. J. Cañal.

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Communicated by José Feijó.

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Viejo, M., Rodríguez, R., Valledor, L. et al. DNA methylation during sexual embryogenesis and implications on the induction of somatic embryogenesis in Castanea sativa Miller. Sex Plant Reprod 23, 315–323 (2010). https://doi.org/10.1007/s00497-010-0145-9

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  • DOI: https://doi.org/10.1007/s00497-010-0145-9

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