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Morphological abnormalities have been reported in insects following the Fukushima Daiichi Nuclear Power Plant (FNPP) accident. Similar abnormalities were also observed during a feeding experiment using contaminated host plants near the FNPP. However, it is unclear whether these morphological abnormalities were directly caused by radiation, as the relationship between the absorbed doses by insects and radiation effects is ambiguous. Therefore, this study aimed to clarify the direct effects of ionizing radiation on lepidopterans by conducting two independent experiments using silkworms: (1) internal exposure using an artificial diet supplemented with cesium-137 (137Cs), and (2) external exposure using γ-ray irradiation. Abnormalities were evaluated by pupal wing-to-whole-body length ratio and somatic mutations via white spots on the larval integument. The results of the internal exposure showed no significant differences in the ratios between the exposed and control groups. A significant difference in the ratio appeared with 80 Gy irradiation in fifth-instar larvae. Additionally, the development of somatic mutations required at least 1 Gy irradiation of eggs. Therefore, it is strongly suggested that low-dose and low-dose-rate exposure to 137Cs radiation is unlikely to cause direct radiation effects in lepidopterans, such as morphological abnormalities and somatic mutations.

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Radiation Effects on Lepidopteran Insects: Internal and External Exposure Experiments on the Silkworm, Bombyx mori

  • 章节

  • 出版模式：

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  • 发表日期：

    2026年

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  • Sota Tanaka,
  • Tadatoshi Kinouchi,
  • Tsuguru Fujii,
  • Tetsuji Imanaka,
  • Tomoyuki Takahashi,
  • Satoshi Fukutani,
  • Daisuke Maki,
  • Akihiro Nohtomi,
  • Sentaro Takahashi

摘要

Morphological abnormalities have been reported in insects following the Fukushima Daiichi Nuclear Power Plant (FNPP) accident. Similar abnormalities were also observed during a feeding experiment using contaminated host plants near the FNPP. However, it is unclear whether these morphological abnormalities were directly caused by radiation, as the relationship between the absorbed doses by insects and radiation effects is ambiguous. Therefore, this study aimed to clarify the direct effects of ionizing radiation on lepidopterans by conducting two independent experiments using silkworms: (1) internal exposure using an artificial diet supplemented with cesium-137 (137Cs), and (2) external exposure using γ-ray irradiation. Abnormalities were evaluated by pupal wing-to-whole-body length ratio and somatic mutations via white spots on the larval integument. The results of the internal exposure showed no significant differences in the ratios between the exposed and control groups. A significant difference in the ratio appeared with 80 Gy irradiation in fifth-instar larvae. Additionally, the development of somatic mutations required at least 1 Gy irradiation of eggs. Therefore, it is strongly suggested that low-dose and low-dose-rate exposure to 137Cs radiation is unlikely to cause direct radiation effects in lepidopterans, such as morphological abnormalities and somatic mutations.