| 2 | Heterosis and combining ability evaluation for growth traits of blunt snout bream(Megalobrama amblycephala)when crossbreeding three strains显示文摘The blunt snout bream(Megalobrama amblycephala)is a major aquaculture species in the Chinese freshwater polyculture system.In this study,complete diallel crossing of three strains(i.e.,Liangzi[LZ],Poyang[PY]and Yuni[YN])was used to evaluate the combining ability and heterosis effect of intraspecific crossbreeding on the growth performance(i.e.,body weight,total length,body length,body height,and Fulton’s coefficient of condition).The offspring produced from the three strains were reared in a communal pond for 20 months,and nine microsatellites were used to assess their pedigree.Of the749 offspring,708(94.53%)could be assigned directly to a single parental pair.Significant differences were observed in body weight(BW)among the different combinations,indicating that the combining ability of BW from each strain was significantly different.The general combining ability(GCA)of BW from the sire was much higher than that from the dam.The GCA for the dam and sire of the LZ and YN were the largest and the smallest,respectively.The special combining ability of YN$9 PY#was the largest,and YN$9 PY#showed significantly positive heterosis effects on all F1growth traits,except for Fulton’s condition coefficient(K)(P\0.05).In addition,significant positive linear correlations were found between the mean BW of corresponding progeny and the H E of the parental generation(y=600.7x-29.472,r=0.8651,P=0.0026),H O(y=1206.9x-518.14,r=0.7436,P=0.0216),and the polymorphism information content(y=1021.3x-331.31,r=0.8245,P=0.0063)as determined by a correlative test.The findings obtained from the study will be important for future considerations of M.amblycephala stock improvement programs. | Wei Luo Cong Zeng Shaokui Yi Nicholas Robinson Weimin Wang Zexia Gao | 2014 | Chinese Science Bulletin2014，59，9： | 7 |
| 10 | 再现鲜活的历史显示文摘1957年,特拉华堡早期移民历史博物馆在纽约州的纳罗斯堡成立,馆址只与早期移民的生活遗址一河相隔。早期移民1754年到达特拉华,便从当地印第安人手里买采土地建起了两处安身之所,并开始了自给自足的生活。博物馆真实地还原了这一切.作为博物馆的假期小讲解员,瑞秋、米兰达和瑞秋的哥哥卢克负责在这里引导游客们按早期原住民的方式在精细复刻的环境里进行生活体验。这里的一切不仅让游客们感受到了在书本里看不到的历史,也让小讲解员们更懂得珍惜当代的生活, | Marileta Robinson Nicholas Piatek | 2016 | 英语沙龙(原版阅读)2016，，7： | 0 |
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