Spontaneous mosaicism occurred in normally fertilized and gynogenetically induced progeny of the kokanee salmon Oncorhynchus nerka |
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| Authors: | MINORU TANAKA SHIZUO KIMURA TAKAFUMI FUJIMOTO SUZU SAKAO ETSURO YAMAHA AND KATSUTOSHI ARAI |
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| Institution: | Laboratory of Breeding Science, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 and; Nanae Fresh Water Laboratory, Field Science Center for Northern Biosphere, Hokkaido University, Nanae, Hokkaido 041-1105, Japan |
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| Abstract: | ABSTRACT: In normally fertilized progeny of the kokanee salmon Oncorhynchus nerka , DNA content flow cytometry revealed that all the externally normal embryos were diploid, whereas abnormal embryos exhibited haplo-diploid, diplo-tetraploid and haplo-diplo-tetraploid mosaicisms, together with a few haploid and diploid individuals. When gynogenetic development was artificially induced by fertilization of eggs obtained from a female of the same kokanee brood stock with UV-irradiated sperm, haplo-diploid mosaics appeared most frequently. These mosaics were likely to happen by certain cytological events, such as meiotic or mitotic errors during the process of maturation, fertilization or early cleavage. |
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| Keywords: | DNA content gynogenesis mosaic polyploid |
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