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The genetic mechanisms of sex determination in sturgeons: their evolutionary role and importance for aquacultureтезисы доклада
- Авторы: Vasil′ev V.P., Vasil′eva E.D.
- Сборник: Aquatic biodiversity and ecosystems conference. Evolution, interaction and global change. 30th August – 4th September 2015, Liverpool
- Тезисы
- Год издания: 2015
- Место издания: Liverpool, UK
- Первая страница: 313
- Аннотация: The sturgeons passed through several stages of polyploidization in their evolution. At present their origin in an indirect polyploidization by repeated interspecific hybridizations seems the most probable. However, in female heterogamety, hybrid tetraploids will always be females and male tetraploids are impossible. The elucidation of the genetic mechanisms of sex determination in sturgeons is also important for the cultivation of these fishes in aquaculture. Very interesting, but conflicting data have been obtained by induced meiotic gynogenesis and dispermic androgenesis in different sturgeon species. Males and females were observed in meiotic gynogenetic progenies of 240-chromosome species Acipenser baerii and A. transmontanus, thus female heterogamety should be concluded for both of them. However, the presence of female in dispermic androgenetic progeny of A. baerii presumes male heterogamety in this fish. To date, the data on sex determination are obtained for three 120-chromosome species: A. stellatus, A. ruthenus, and Polyodon spathula, as well as for A. ruthenus x A. huso hybrid (bester). All of them have female heterogamety. The sex ratio in the gynogenetic progenies of two last species and bester was about 1♂:4♀. All-male gynogenetic progeny of A. stellatus indicates the absence of crossing-over and non-viability of WW-superfemales.
- Добавил в систему: Васильева Екатерина Денисовна