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《Journal of Northeast Forestry University》 2011-01
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Family Selection from Intensive Seed Orchard of Betula platyphylla

Jiang Jing,Yang Guang,Zhu Zebing,Yang Yulin(Key Laboratory of Forest Tree Genetic Improvement and Biotechnology(Northeast Forestry University),Ministry of Education,Harbin 150040,P.R.China);Yang Shizhen(Academy of Forestry Sciences of Jilin City)  
A survey was conducted to study the variation in growth and wood quality traits of five-year-old open-pollinated progeny of half-sib families from an intensive seed orchard of Betula platyphylla.There were extremely significant differences in height,diameter at breast height(DBH),wood density,fiber width,benzene-alcohol extractive content and holocellulose content among families,indicating that there was great potential for family selection in these traits.Family heritability of these traits ranged from 0.60 to 0.97,and the holocellulose content showed the highest heritability(0.97).The genetic variation coefficient of benzene-alcohol extractive content and DBH reached 20.39% and 19.52% respectively,but the other traits did not reach 10% at all.The LSD multiple comparison test between the tested families and the control family showed that eight families were significantly higher than the control family in height and DBH growth respectively;five families were significantly higher in wood density;two families were significantly better in benzene-alcohol extractive content and holocellulose content respectively.Six superior families were selected by the Smith-Hazel comprehensive index method.For the six selected families,the average genetic gains of height,DBH,fiber width and benzene-alcohol extractive content were 16.56%,37.26%,19.16% and-14.30% respectively.Benzene-alcohol extractive content showed an expected reversed genetic gain.The average genetic gains of wood density and holocellulose content were lower,which were 2.20% and 1.57% respectively.The six selected superior families could provide elite variety for the oriented cultivation of birch plywood and pulpwood in the eastern part of Northeast China.
【Fund】: 国家科技支撑计划专题(2006BAD01A1603、2006BAD24B05);; 国家林业局项目(2009002)
【CateGory Index】: S792.153
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