Signification of the Sexualizing Substance Produced by the Sexualized Planarians(Reproductive Biology)
スポンサーリンク
概要
- 論文の詳細を見る
Asexual worms of an exclusively fissiparous strain (the OH strain) of the planarian Dugesia ryukyuensis keep developing hermaphroditic reproductive organs and eventually undergo sexual reproduction instead of asexual reproduction, namely fission, if they are fed with sexually mature worms of an exclusively oviparous planarian, Bdellocephala brunnea, suggesting that the sexually mature worms has a sexualizing substance (s). The fully sexualized worms no longer need the feeding on sexual worms to maintain the sexuality. Here, we demonstrate that the sexualized worms produce enough of their own sexualizing substance similar to that contained in B. brunnea. In case of surgical ablation of the sexualized worms, the fragments with sexual organs regenerate to become sexual, while those without sexual organs, namely head fragments, regenerate to return to the asexual state. The asexual regenerants from the sexualized worms are also fully sexualized by being fed with B. brunnea. Additionally, it was reported that head region in sexually mature worms lacks the putative sexualizing substance necessary for complete sexualization (Sakurai, 1981). These results suggest that the fragments without sexual organ lack enough of an amount of the putative sexualizing substance and the sexuality is maintained by the sexualizing substance contained in the sexualized worms.
- 社団法人日本動物学会の論文
- 2002-06-25
著者
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Hoshi Motonori
Center for Life Science and Technology, Graduate School of Science and Technology, Keio University
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Hoshi Motonori
The University Of The Air
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Hoshi Motonori
Department Of Biosciences And Informatics And Center For Life Science And Technology Keio University
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Hoshi Motonori
Center For Life Science And Technology Graduate School Of Science And Technology Keio University
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Hase Sumitaka
Department of Biology, Keio University
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Hase S
Department Of Biology Keio University
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Hase Sumitaka
Department Of Biology Keio University
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Hoshi Motonori
Department Of Life Sciemce And Technology Tokyo Institute Of Technology
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ARIOKA Sachiko
Department of Biosciences and Informatics, Keio University
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Arioka Sachiko
Center for Life Science and Technology, Graduate School of Science and Technology, Keio University
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Arioka S
Center For Life Science And Technology Graduate School Of Science And Technology Keio University
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Kobayashi Kazuya
Department Of Electrical And Electronic Engineering Chuo University
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Arioka Sachiko
Center For Life Science And Technology Graduate School Of Science And Technology Keio University
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Kobayashi K
Department Of Biological Sciences And Informatics Keio University
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Kobayashi Kazuya
"Form and Function", PRESTO, Japan Science and Technology Corporation (JST)
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星 元紀
The University Of The Air
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Kobayashi K
Department Of Electrical Electronic And Communication Engineering Chuo University
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