Spontaneous polyploidization in critically endangered <Emphasis Type="Italic">Acipenser mikadoi</Emphasis> |
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| Authors: | Milo? Havelka He Zhou Seishi Hagihara Masaki Ichimura Takafumi Fujimoto Etsuro Yamaha Shinji Adachi Katsutoshi Arai |
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| Institution: | 1.Faculty and Graduate School of Fisheries Sciences,Hokkaido University,Hokkaido,Japan;2.Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses,University of South Bohemia in Ceske Budejovice,Vodňany,Czech Republic;3.Key Laboratory of Mariculture and Stock Enhancement in North China’s Sea, Ministry of Agriculture,Dalian Ocean University,Dalian,China;4.Shibetsu Salmon Museum,Hokkaido,Japan;5.Nanae Fresh-Water Station, Field Science Center for Northern Biosphere, Hokkaido University,Hokkaido,Japan |
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| Abstract: | We investigated the source of spontaneous polyploidization in the critically endangered Acipenser mikadoi. Fourteen sib progeny of A. mikadoi and 11 hybrids between an A. mikadoi female and a Huso dauricus male, all showing atypically high ploidy, were analysed. Parent assignment based on five highly polymorphic microsatellite markers confirmed spontaneous duplication of maternal chromosome sets via retention of the second polar body to be the source of spontaneous polyploidization. To our knowledge, this provides the first evidence of the maternal origin of spontaneous polyploidization in A. mikadoi. Factorial correspondence analysis of the multilocus microsatellite genotypes placed the parent fish of spontaneous polyploids in clearly delineated clusters of A. mikadoi and H. dauricus, and parent fish had mitochondrial control region haplotypes corresponding to their presumed species. Thus, parent fish were confirmed to be of pure genetic origin, and hybridization did not promote the observed spontaneous polyploidization. |
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