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Polymorphic microsatellite differences among four cultured populations of two selected tilapia strains

文献类型： 外文期刊

作者： Li, Dayu 1 ; Yang, Hong 1 ; Zou, Zhiying 1 ; Xiao, Wei 1 ; Zhu, Jingling 1 ; Luo, Yongju 2 ;

作者机构： 1.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Chinese Minist Agr, Wuxi 214081, Peoples R China

2.Guangxi Fisheries Res Inst, Nanning, Peoples R China

关键词： microsatellite;Nile tilapia;Blue tilapia;heterozygosity;genetic diversity;selection;loss of genetic variation

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN：

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收录情况： SCI

摘要： Genetic diversity plays a vital role for maintaining economically important traits in fish populations. The goal of this study was to assess the genetic variability among four tilapia populations in China. Two populations named XA (Oreochromis aureus, 30 samples) and AN (Egyptian Oreochromis niloticus, 24 samples) were gathered from Freshwater Fisheries Research Center (FFRC), and the other two named AL (O. aureus, 30 samples) and AJ (Egyptian O. niloticus, 30 samples) were from Guangxi Fisheries Research Institute (GFRI). GFRI introduced AL and AJ from XA and AN, and selected them for generations. We want to know if AL and AJ have genetic changes after selection and generations. Fifteen polymorphic microsatellite markers were used. Our results indicated that the four tilapia populations showed moderate genetic variability. The polymorphism information content (PIC) of the four populations was from 0.28 to 0.39; A(e) was from 1.67 to 2.15; the H-e was from 0.35 to 0.46; the genetic similarity indexes were from 0.94 to 0.69 and also the clustering result showed that these four populations were highly related. There were no significant changes in genetic variation between late-introduced population and early-introduced population of O. aureus. Our results helped to understand the genetic variability of tilapia populations in China and for future marker-assisted selection for important economic traits.

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