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<p><i>Trissolcus japonicus</i> (Ashmead), native to Japan, has been known as an egg parasitoid of stink bugs. In particular, <i>T. japonicus</i> has been regarded as a potential biological control agent against the brown marmorated stink bug, <i>Halyomorpha halys</i> (Stål), which has spread to North America, South America, and Europe. While previous studies have suggested that <i>T. japonicus</i> has multiple strains with different genetic backgrounds that may lead to host-associated genetic differentiation, there has been limited research on this topic in the native range of <i>T. japonicus</i>. Additionally, it is suggested that <i>T. japonicus</i> contains multiple mitochondrial DNA lineages and varies in their ability to utilize different host species. This study aimed to investigate the genetic groups within <i>T. japonicus</i> specimens in Japan and their relation to geographic distribution, host use, and morphological characters using a mitochondrial DNA fragment and 429 genome-wide single nucleotide polymorphisms. The results of this study suggest the presence of multiple distinct genetic groups within <i>T. japonicus</i> specimens. These genetic differences did not align with clear differences in host specificity and/or availability; however, each genetic group was found in association with different host species, suggesting that they had potential differences in host range. Furthermore, multiple strains of <i>T. japonicus</i> were found to be distributed sympatrically with potential variation in host preferences. The use of such DNA sequence data was useful in recognizing and distinguishing between genetic strains of <i>T. japonicus</i> and will be important for identifying species through characteristics other than morphology. The importance of an integrated classification method and accurate identification database was also discussed.</p>

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Genetic divergence within Trissolcus japonicus (Hymenoptera: Scelionidae) in its native range

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Kazunori Matsuo,
  • Nakatada Wachi,
  • Akeo Iwasaki,
  • Ken Funayama,
  • Ken Tabuchi,
  • Shunsuke Furihata,
  • Akihiko Takahashi,
  • Masatoshi Toyama,
  • Hisatomo Taki,
  • Hiromi Mukai,
  • Toshiharu Mita,
  • Shin Komagata,
  • Marisa Tomita,
  • Akane Sato-Miura,
  • Kyo Itoyama,
  • Takuto Hirooka,
  • Yoko Takematsu,
  • Yoshimitsu Higashiura,
  • Kenichi Kanai,
  • Tomoko Ganaha-Kikumura

摘要

Trissolcus japonicus (Ashmead), native to Japan, has been known as an egg parasitoid of stink bugs. In particular, T. japonicus has been regarded as a potential biological control agent against the brown marmorated stink bug, Halyomorpha halys (Stål), which has spread to North America, South America, and Europe. While previous studies have suggested that T. japonicus has multiple strains with different genetic backgrounds that may lead to host-associated genetic differentiation, there has been limited research on this topic in the native range of T. japonicus. Additionally, it is suggested that T. japonicus contains multiple mitochondrial DNA lineages and varies in their ability to utilize different host species. This study aimed to investigate the genetic groups within T. japonicus specimens in Japan and their relation to geographic distribution, host use, and morphological characters using a mitochondrial DNA fragment and 429 genome-wide single nucleotide polymorphisms. The results of this study suggest the presence of multiple distinct genetic groups within T. japonicus specimens. These genetic differences did not align with clear differences in host specificity and/or availability; however, each genetic group was found in association with different host species, suggesting that they had potential differences in host range. Furthermore, multiple strains of T. japonicus were found to be distributed sympatrically with potential variation in host preferences. The use of such DNA sequence data was useful in recognizing and distinguishing between genetic strains of T. japonicus and will be important for identifying species through characteristics other than morphology. The importance of an integrated classification method and accurate identification database was also discussed.