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Development of Polyspermic Rice Zygotes.

Erika Toda1, Yukinosuke Ohnishi1, Takashi Okamoto2

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Polyspermic rice zygotes, created by fusing one egg with two sperm, successfully divided and developed into triploid plants. This suggests polyspermy can be a pathway for generating triploid plants in angiosperms.

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Area of Science:

  • Plant reproductive biology
  • Cellular and molecular biology
  • Genetics

Background:

  • Fertilization restores diploid genomes in eukaryotes.
  • Polyspermy, or multiple fertilizations, occurs in many species, leading to aberrant development in animals due to extra centrioles.
  • Angiosperms lack centrosomes, suggesting polyspermic zygotes may survive, but their developmental profiles remain uncharacterized.

Purpose of the Study:

  • To investigate the cellular-level developmental profiles of polyspermic zygotes in angiosperms.
  • To determine if polyspermic zygotes can develop into viable embryos.
  • To explore the potential of polyspermy as a mechanism for generating triploid plants.

Main Methods:

  • Production of polyspermic rice zygotes via electric fusion of one egg cell with two sperm cells.
  • Monitoring the nuclear fusion and mitotic division of these polyspermic zygotes.
  • Observing the subsequent embryonic development and plant regeneration.

Main Results:

  • Fused sperm and egg nuclei formed a zygotic nucleus.
  • Polyspermic zygotes underwent mitotic division with a typical bipolar spindle, forming a two-celled embryo.
  • These triploid embryos developed and regenerated into triploid plants.

Conclusions:

  • Polyspermic plant zygotes possess the potential to develop into triploid embryos.
  • Polyspermy in angiosperms may serve as a natural pathway for the formation of triploid plants.
  • This process could significantly contribute to the generation of autopolyploids.