| 双向选择对团头鲂生化遗传变异的影响↑（*） |
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| 引用本文： | 李思发,杨学明.双向选择对团头鲂生化遗传变异的影响↑（*）[J].中国水产科学,1996,3(1):1-5. |
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| 作者姓名： | 李思发 杨学明 |
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| 作者单位： | 上海水产大学水产增养殖生态生理农业部重点实验室!200090 |
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| 摘 要： | 本文报导双向选择对团头鲂生化遗传变异的影响。试验材料鱼包括来自淤泥湖的原种，１９８６－１９９４年群体选育的第四代（“选育 Ｆ４”），以及１９９１、１９９４年连续兄妹杂交的第二代（“近交Ｆ２”）。计检测了８种同工酶，１９个位点。三群体的多态座位比例一致（５．２６％），但平均杂合度趋异。“选育Ｆ４”平均杂合度最高（０．０２１３），“近交Ｆ２”最低（０．０１７４）。经４代选育，平均杂合度增加４％，而经２代近交，平均杂合度降低１５％。
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| 关 键 词： | 团头鲂 双向选择 原种 选育F4 近交F2 生化遗传 |
| 修稿时间： | 2010/4/8 0:00:00 |
EFFECTS OF TWO-WAY SELECTION ON BIOCHEMICAL GENETICS OF BLUNT SNOUT BREAM (Megalobrama amblycephala) |
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| Li Sifa Yang Xueming.EFFECTS OF TWO-WAY SELECTION ON BIOCHEMICAL GENETICS OF BLUNT SNOUT BREAM (Megalobrama amblycephala)[J].Journal of Fishery Sciences of China,1996,3(1):1-5. |
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| Authors: | Li Sifa Yang Xueming |
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| Abstract: | The effects of two - way selection on the variety of biochemical genetic markers of three groups of blunt snout bream (Megalobrama amblycephala ) were examined. One group of the brood stock fish were collecced from the Yuni Lake. The Second group are the 4th generation (1986-1994) produced by mass selection (selected-F4), and the third group are the 2nd generation (1991, 1994) of full-sib breeding (inbred -F4). Nineteen loci, 8 enzymes were studied. Results showed that, the ratio of the polymorphyism(P) were the same (5. 26% ) in 3 groups; but the average heterozygosity (H) showed divergent. The selcted -F4 was of the highest H - 0. 0213, the inbred-F2 was of the lowerest H-0.0174. The heterzygosity increased by 4% through 4 generations selection, in the other side, the heterozygosity decresaed to 15% through 2 generation of high inbreeding. |
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| Keywords: | Blunt snout bream Two - way selection Brood stock Selected - F4 Inbred-F2 Biochemical genetics |
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