从XY雌鱼雌核发育产生YY超雄黄颡鱼
YY SUPERMALE GENERATED GYNOGENETICALLY FROM XY FEMALE IN PELTEOBAGRUS FULVIDRACO (RICHARDSON)
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摘要: 采用激素性逆转结合雌核发育技术,从XY雌鱼产生YY超雄黄颡鱼。与性逆转和后代测交选种技术比较,本文的方法可以缩短两代的育种时间,并提高超雄鱼的产出。通过测交证明,与正常的XY雄鱼一样,YY超雄黄颡鱼是能成活和有生育力的,其后代雄鱼占75.9%-100%,平均90.30%。从29尾雌鱼产生的雌核发育的后代294尾,只有11尾雄鱼,绝大多数是雌鱼;而在12尾YY超雄鱼测交的后代出现0-24.1%雌鱼。从上述结果可以推测,黄颡鱼的性决定体制是雌性配子同型(XX♀/XY♂),但常染色体性修饰基因的影响是比较明显的。本文还对超雄鱼在商业上大量生产全雄黄颡鱼的可行性和应用前景进行简要的讨论。Abstract: Supermale (YY ♂) P. fulvidraco was generated by combining the hormone sex reversal with gynogenetic technique. Comparing with the sex reversal and progeny testing selection technique, the combination of techniques described in present paper reduced the time comsumption of selective breeding two generations and increased supermale yield. YY male genotypes proved through progeny testing to be as viable and fertile as normal XY male and sired a mean progeny sex ratio of 9013% male,ranging from 7519% to 100%.294 meiogynogens produced from 29 normal females were predominately female, and merely 11 males and 12 supermales sired female progenies at the frequencies between 0 and 2411%. Fromthese results mentioned above,the sex de-termination system in P.fulvidraco was presumed to be female homogamety, but the influences of autosomal sex modifying genes were more obviously.The feasibility and application prospect for commercial mass production all male P. fulvidraco were discussed briefly.
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Keywords:
- P.fulvidraco /
- Sex reversal /
- Gynogenesis /
- Supermale
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