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An improved hybrid bream derived from a hybrid lineage of Megalobrama amblycephala(♀)×Culter alburnus(♂)

查看全文 作　　者：Dingbin [1,2]Gong;Min [1,2]Tao;Lihui [1,2]Xu;Fangzhou [1,2]Hu;Zehong [1,2]Wei;Shi [1,2]Wang;Yude [1,2]Wang;Qingfeng [1,2]Liu;Chang [1,2]Wu;Kaikun [1,2]Luo;Chenchen [1,2]Tang;Rong [1,2]Zhou;Chun [1,2]Zhang;Yuequn [1,2]Wang;Shaojun [1,2]Liu 高影响力作者 机构地区：[1]State Key Laboratory of Developmental Biology of Freshwater Fish,Hunan Normal University,Changsha 410081,China;[2]College of Life Sciences,Hunan Normal University,Changsha 410081,China高影响力机构 出　　处：《Science China(Life Sciences)》索引2022年第65卷第6期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(31730098,31802287,31430088,31872315,U19A2040);the Earmarked Fund for China Agriculture Research System(CARS-45);the Hunan Provincial Natural Science and Technology Major Project(2017NK1031);the Cooperative Innovation Center of Engineering and New Products for Developmental Biology of Hunan Province(20134486);the National Key Research and Development Program of China(2018YFD0901202);the High-level Talent Agglomeration Program of Hunan,China(2019RS1044)。 摘　　要：Distant hybridization is an important technique in fish genetic breeding.In this study,based on the establishment of an allodiploid fish lineage(BT,2n=48,F_(1)–F_(6))derived from distant hybridization between female Megalobrama amblycephala(BSB,2n=48)and male Culter alburnus(TC,2n=48),and the backcross progeny(BTB,2n=48)derived by backcrossing female F_(1) of BT to male BSB,an improved hybrid bream(BTBB,2n=48)was obtained by backcrossing BTB(♀)to BSB(♂).Moreover,the morphological and genetic characteristics of BTBB individuals were investigated;BTBB was similar to BSB in appearance but had a higher body height than BSB.The study results regarding chromosome numbers and DNA content indicated that BTBB is a diploid hybrid fish.The 5S rDNA and Hox gene of BTBB were inherited from the original parents.Gonadal development in BTBB was normal.On the other hand,BTBB had a faster growth rate,higher muscle protein level,and lower muscle carbohydrate level than BSB.Hence,bisexual fertile BTBB is promoted and can be applied as a high-quality fish,and it can also be used as a new fish germplasm resource to develop high-quality fish further.Thus,this study is of great significance for fish genetic breeding. 关 键 词：distant hybridization Megalobrama amblycephala BACKCROSSING improved germplasm resources
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