Seasonal Changes In the Sexualization of the Planarian Dugesia ryukyuensis : Reproductive Biology
スポンサーリンク
概要
- 論文の詳細を見る
Asexual individuals in a fissiparous clone of the planarian Dugesia ryukyuensis develop hermaphroditic sexual organs and eventually undergo sexual reproduction instead of a sexual reproduction if they are fed with the adults of Bdellocephala brunnea, an oviparous planaria. The experimental sexualization means that the adults of B.brunnea contain a putative sexualizing substance(s), which is the first candidate for the chemical(s) responsible for switching from a sexual to sexual reproduction in metazoans. In the present study, the feeding experiment over two consecutive years revealed that the experimental sexualization has seasonal changes. In summer, the a sexual individuals were not fully sexualized, though they developed a pair of ovaries. The developing ovaries degenerate if the feeding is stopped. On the contrary, in winter, they developed all the sexual organs. The sexual organs keep developing even if the feeding is stopped after a certain critical point named the point-of-no-return. It was demonstrated that the extreme difterence of the sexualization was attributed to the seasonal change of the quality and/or quantity of the sexualizing substance contained in B.brunnea, as well as the minor change of the susceptibility to the sexualizing substance in the a sexual individuals. On the other hand, the histological research of B.brunnea revealed that the degree of the maturation of the sexual organs varied extremely through a year. Taking these results in to account, we suggest that the production of the sexualizing substance has no direct relation to any particular mature sexual organs.
- 2002-11-25
著者
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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
Department Of Biosciences And Informatics 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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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 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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