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Pressure and cold shock induction of meiotic gynogenesis and triploidy in the European sea bass, Dicentrarchus labrax L.: relative efficiency of methods and parental variability ArchiMer
Peruzzi, Stefano; Chatain, Beatrice.
The optimal conditions for the retention of the second polar body in sea bass eggs were investigated by altering the timing, intensity and duration of application of pressure and cold shocks. Treatment optima for cold shocks were 0-1 degrees C for 15-20 min at 5 min after fertilisation (a.f.) and 8500 psi for 2 min at 6 min a.f. for pressure shocks. Meiogenesis was obtained by fertilising eggs with UV-irradiated homologous sperm (32,000 erg mm(-2)) and pressure or cold shocking eggs as above. 100% triploidy was induced following definition of liable periods for the disruption of the meiotic spindle obtained in gynogenesis. Ploidy investigations were performed on experimental groups by flow-cytometry. Verification of uniparental transmission in meiogens was...
Tipo: Text Palavras-chave: Parental variability; Pressure and cold shocks; Dicentrarchus labrax; Sea bass; Triploidy; Meiotic gynogenesis.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-507.pdf
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