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- Title
First Evidence for Hybrid Breakdown in the Backcross of Olive Flounder, Paralichthys olivaceus, and Summer Flounder, Paralichthys dentatus.
- Authors
DONGDONG XU; FENG YOU; JUN LI; ZHIHAO WU; ZHIZHONG XIAO; PEIJUNG ZHANG; YONGLI XU; BO WANG
- Abstract
Hybrid and parental backcross experiments were performed using olive flounder, Paralichthys olivaceus, summer flounder, Paralichthys dentatus, and their female F1 hybrids to examine hybrid fitness in the backcross. Fertilization rate, hatching rate, and combined fitness measure (CFM, product of fertilization rate and hatching rate) were detected and the results showed that the CFM of hybrid and backcross generations was reduced significantly compared to pure olive flounder crosses. Genomic inheritance from parents to backcross progeny was also detected by amplified fragment length polymorphism (AFLP). Almost all AFLP bands observed in parents were presented in backcross progeny (backcross1, 218/227; backcross2, 265/282), although 9 and 17 parental bands were missing in backcross1 and backcross2, respectively. Novel bands (absent in parents) also occurred in progeny at the frequencies of 5.63% (13/231) in backcross1 and 3.28% (9/274) in backcross2. Additionally, 27.40 and 31.18% of AFLP markers deviated from expected Mendelian ratio in backcross1 and backcross2, respectively. The present study suggests that genetic incompatibilities may exist between olive flounder and summer flounder. Furthermore, possible implications of segregation distortion for reduced hybrid fitness in backcross generations are discussed.
- Subjects
PARALICHTHYS; FISH genetics; FISH farming; SPECIES hybridization; PARALICHTHYIDAE
- Publication
Journal of the World Aquaculture Society, 2011, Vol 42, Issue 3, p347
- ISSN
0893-8849
- Publication type
Article
- DOI
10.1111/j.1749-7345.2011.00473.x