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Related Experiment Video

Updated: May 6, 2026

Author Spotlight: Streamlining Rice Breeding with CRISPR/Cas for Obtaining Optimal Phenotypic and Agronomic Traits
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Is an egg-killer present in rice?

Y Sano1

  • 1National Institute of Genetics, 411, Mishima, Japan.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 7, 2013
PubMed
Summary
This summary is machine-generated.

The S5 (i) allele in rice does not act as an egg-killer, challenging the proposed genetic model for hybrid sterility. Further research is needed to understand wide compatibility in Asian rice cultivars.

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Area of Science:

  • Genetics
  • Plant Breeding
  • Reproductive Biology

Background:

  • Hybrid sterility in Asian rice (Oryza sativa) is partly explained by an allelic interaction at the S5 locus.
  • This interaction is proposed to involve an 'egg-killer' mechanism, leading to megaspore abortion and influencing wide compatibility.

Purpose of the Study:

  • To experimentally confirm if the S5 (i) allele functions as an egg-killer against the S5 (j) allele in Indica-Japonica rice hybrids.
  • To validate the proposed genetic model for hybrid sterility and wide compatibility in rice.

Main Methods:

  • Conducted backcrossing experiments with Indica-Japonica rice hybrids.
  • Assumed the involvement of S5 (i) and S5 (j) alleles in the crosses.
  • Analyzed progeny for evidence of an egg-killer, characterized by high transmission rates through the egg.

Main Results:

  • An egg-killer was readily identifiable using the backcross experimental design.
  • However, no egg-killer activity was detected in the tested Indica-Japonica rice hybrid.
  • This finding contradicts the expectation based on the proposed S5 locus genetic model.

Conclusions:

  • The proposed genetic mechanism involving an S5 (i) egg-killer allele is not supported by the experimental evidence in this Indica-Japonica hybrid.
  • The genetic basis for hybrid sterility and wide compatibility in Asian rice may require a revised or alternative explanation.
  • Caution is advised regarding the current genetic model for hybrid sterility in Asian rice cultivars.