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Updated: Nov 15, 2025

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Compositional equivalence assessment of insect-resistant genetically modified rice using multiple statistical

Seon-Woo Oh1, Eun-Ha Kim2, So-Young Lee2

  • 1R&D Coordination Division, Rural Development Administration, Jeollabuk-do, Republic of Korea.

GM Crops & Food
|March 2, 2021
PubMed
Summary

Transgenic Bt rice, containing the mCry1Ac gene from Bacillus thuringiensis, demonstrated compositional equivalence to conventional rice varieties. Environmental factors, not genetic modification, significantly influenced compositional variability in field trials.

Keywords:
Bt riceCompositionGMONatural variationRice (Oryza sativa ssp. japonica)

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Area of Science:

  • Agricultural Science
  • Biotechnology
  • Food Safety

Background:

  • Genetically modified (GM) crops, such as Bt rice, require rigorous safety assessments.
  • The mCry1Ac gene from Bacillus thuringiensis (Bt) is used in developing insect-resistant rice varieties.
  • Compositional analysis is a key component in evaluating the safety of transgenic crops.

Purpose of the Study:

  • To assess the safety and compositional equivalence of transgenic Bt rice containing the mCry1Ac gene.
  • To compare Bt rice with near-isogenic non-Bt rice and commercial cultivars under field conditions.
  • To identify factors contributing to compositional variability in rice.

Main Methods:

  • Field trials were conducted over two years at two locations in South Korea.
  • Compositional analyses included proximates, minerals, amino acids, fatty acids, vitamins, and antinutrients.
  • Statistical methods, including ANOISM, SIMPER, and PERMANOVA, were used to analyze compositional data.

Main Results:

  • Significant compositional differences between Bt rice and non-Bt rice were observed but remained within reference ranges.
  • Multivariate analyses indicated that environmental factors had a greater impact on compositional variability than genetic factors.
  • Bt rice was found to be compositionally equivalent to conventional rice varieties.

Conclusions:

  • Transgenic Bt rice with the mCry1Ac gene is compositionally equivalent to conventional rice.
  • Environmental influences are more significant drivers of rice compositional variability than genetic modification.
  • The applied statistical approach provides a robust method for evaluating GM crop safety.