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Title: カラフトマスとサクラマス間の正逆雑種における遺伝的性の偏り
Other Titles: Skewed genetic sex ratio in reciprocal hybrids between pink salmon and masu salmon
Authors: Shima, Fumika Browse this author
Asanuma, Rei Browse this author
Kaneyasu, Takahisa Browse this author
Ichimura, Masaki Browse this author
Takahashi, Eisuke Browse this author
Yamaha, Etsuro Browse this author →KAKEN DB
Fujimoto, Takafumi Browse this author →KAKEN DB
Arai, Katsutoshi Browse this author →KAKEN DB
Keywords: sdY
Issue Date: 15-Nov-2021
Publisher: 日本水産学会(Japanese Society of Fisheries Science)
Journal Title: 日本水産学会誌 Nippon suisan gakkaishi
Volume: 87
Issue: 5
Start Page: 473
End Page: 482
Publisher DOI: 10.2331/suisan.20-00036
Abstract: サケ科魚類の人為雑種において,性比が一方に偏る例が報告されてきたが,これらは生殖腺の表現型に基づく。本研究では,カラフトマスとサクラマス間の正逆雑種について,雄特異的な性決定遺伝子sdYの有無による遺伝的性を検討した。その結果,カラフトマス雌×サクラマス雄,サクラマス雌×カラフトマス雄の8か月齢魚の遺伝的性は雌に,サクラマス雌×カラフトマス雄の12か月齢魚は雄に偏った。初期胚と孵化仔魚の遺伝的性比は1:1であったことから雑種の性比の偏りは成長過程における生残率の雌雄差により生じたと考えられた。
Skewed sex ratio has often been observed in hybrids, but the sex was always determined by gonadal phenotypes. Here, we artificially induced reciprocal hybrids between pink salmon and masu salmon and then examined the genetic sex ratio in the hybrids based on the presence or absence of the sex-determining gene sdY. As a result, the sex of 8-month-old hybrids between pink salmon female x masu salmon male and masu salmon female x pink salmon male skewed to female, while 12-month-old hybrids between masu salmon female x pink salmon male were exclusively male. Since the sex ratio between the early embryos and hatching alevin was 1:1, it was considered that the skewed sex ratio was due to the difference of survival rate between genetic males and females.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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