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Early Embryo and Larval Development of Inviable Intergeneric Hybrids Derived from Crassostrea angulata and saccostrea cucullata

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Journal of Ocean University of China 2016年第3期15卷 515-522页

作者： SU Jiaqi WANG Zhaoping ZHANG Yuehuan YAN Xiwu LI Qiongzhen YU Ruihai Key Laboratory of Mariculture of Ministry of Education Fisheries College Ocean University of China Key Laboratory of Tropical Marine Biological Resources and Ecology South China Sea Institute of OceanologyChinese Academy of Sciences Engineering Research Center of Shellfish Culture and Breeding of Liaoning Province College of Fisheries and Life Science Dalian Ocean University Key Laboratory of Mariculture Guangxi Academy of Fishery Science

To detect the intergeneric hybridization between the oyster Crassostrea angulata and saccostrea cucullata coexisting along the southern coast of China, reciprocal crosses were conducted between the two species. Barriers for sperm recognizing, binding, penetrating the egg, and forming the pronucleus were detected by fluorescence staining. From the results, although fertilization success was observed in hybrid crosses, the overall fertilization rate was lower than that of intraspecific crosses. A large number of hybrid larvae died at 6–8 d after hatching, and those survived could not complete metamorphosis. C. angulata ♀× S. cucullata ♂ larvae had a growth rate similar to that of the maternal species, whereas S. cucullata ♀× C. angulata ♂ larvae grew the slowest among all crosses. Molecular genetics analysis revealed that hybrid progeny were amphimixis hybrids. This study demonstrated that hybrid embryos generated by crossing C. angulata and S. cucullata could develop normally to the larval state, but could not complete metamorphosis and then develop to the spat stage. Thus, there is a post-reproductive isolation between C. angulata and S. cucullata.

关键词： Crassostrea angulata saccostrea cucullata intergeneric hybridization hybrid inviability reproductive isolation

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