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- W2049274293 abstract "To date, pressure shock, heat shock, and chemical treatment with cytochalasin B have been the major methods used to induce triploid bivalves. In this study, triploid bivalves were induced by a new chemical treatment using 6-dimethylaminopurine (6-DMAP). The capacity of 6-DMAP to produce triploid eggs and larvae was investigated in the Pacific oyster, Crassostrea gigas, the giant sea scallop, Placopecten magellanicus, and the blue mussel, Mytilus edulis. The triploid yields from the 6-DMAP treatments were compared with those of cytochalasin treatments. The highest percentage of triploid production was 90% in the Pacific oysters when the fertilized eggs were treated for 20 min with 300 μM 6-DMAP at 15 min after fertilization and 95% in the giant scallops when treated for 15 min with 400 μM 6-DMAP at 70 min after fertilization. Increasing durations of 6-DMAP treatments improved the efficiency of triploid induction. However, long incubations with 6-DMAP, which overlapped the period of first mitotic cleavage, led to the development of abnormal larvae. These included low percentages of normal veliger larvae in the Pacific oysters and developmental arrest at the trochophore stage in the blue mussels. The percentage of abnormalities increased with increased treatment duration. Triploid larvae of Pacific oysters produced by 6-DMAP or cytochalasin treatments had equivalent growth rates and were similar to those of control diploid larvae. However, triploid larvae showed high mortalities following these two chemical treatments. Overall, the results clearly demonstrate that 6-DMAP was an efficient and practical inducer of triploidy in bivalve molluscs. Moreover, the described procedure is the most simple and reproducible method ever reported. In addition, 6-DMAP is safer to handle than cytochalasin which is classified as a carcinogen." @default.
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- W2049274293 date "1993-07-01" @default.
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- W2049274293 title "A novel method to produce triploids in bivalve molluscs by the use of 6-dimethylaminopurine" @default.
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- W2049274293 doi "https://doi.org/10.1016/0022-0981(93)90127-a" @default.
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