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Embryo Rescue Protocol for Interspecific Hybridization in Squash
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Embryo Rescue in Plant Breeding.

Ugo Rogo1, Marco Fambrini1, Claudio Pugliesi1

  • 1Department of Agriculture Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy.

Plants (Basel, Switzerland)
|September 9, 2023
PubMed
Summary

Embryo rescue (ER) techniques overcome plant hybridization barriers by culturing immature embryos. These methods enable the introgression of valuable traits from wild species into crops, enhancing agricultural resilience.

Keywords:
axenic cultureembryo-lethal mutantshybridizationimmature embryoin vitro pollinationplant breedingploidy levelspost-zygotic barriers

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Area of Science:

  • Plant Biotechnology
  • Reproductive Biology
  • Agricultural Science

Background:

  • Embryo rescue (ER) encompasses established in vitro tissue culture protocols for plant development.
  • ER facilitates the creation of viable plants from immature or lethal embryos.
  • Hybridization crosses are crucial for introgression of agriculturally important alleles from wild species.

Purpose of the Study:

  • To review and highlight the significance of embryo rescue techniques in overcoming reproductive barriers.
  • To underscore the role of ER in facilitating successful hybridization and trait introgression.
  • To explore the diverse applications of ER in plant breeding and research.

Main Methods:

  • ER involves culturing immature embryos on nutrient media.
  • Strategies to overcome pre-zygotic barriers include cut-style, graft-on-style, mixed pollen, and in vitro ovule pollination.
  • Post-zygotic barriers, often due to endosperm failure, are addressed by rescuing embryos.

Main Results:

  • ER successfully enables the development of hybrid embryos that would otherwise abort.
  • Techniques facilitate introgression of traits like stress resistance and improved morphology.
  • ER aids in producing haploids, doubled haploids, and chromosome engineering lines.

Conclusions:

  • Embryo rescue is a vital tool for overcoming pre- and post-zygotic barriers in plant hybridization.
  • ER significantly contributes to crop improvement by enabling introgression of desirable traits.
  • The technique also supports research on embryonic development and propagation of rare species.