Rice is one of the most important staple cereals,feeding over 60%of China’s population and contributes nearly 40%of the national total caloric intake（Cheng et al.2007）.A sustainable increase in rice production is r...Rice is one of the most important staple cereals,feeding over 60%of China’s population and contributes nearly 40%of the national total caloric intake（Cheng et al.2007）.A sustainable increase in rice production is required to meet the demands of increasing population and food consumption（Tilman et al.2011）.展开更多
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 ...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.展开更多
文摘Rice is one of the most important staple cereals,feeding over 60%of China’s population and contributes nearly 40%of the national total caloric intake（Cheng et al.2007）.A sustainable increase in rice production is required to meet the demands of increasing population and food consumption（Tilman et al.2011）.
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)+3 种基金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)。
文摘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.
