Time Trends in Genetic Parameters for Height and Optimal Age for Parental Selection in Scots Pine
Time Trends in Genetic Parameters for Height and Optimal Age for Parental Selection in Scots Pine
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DOI：
10.1093/forestscience/49.5.696
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发表时间：
2003-10
期刊：
影响因子：
1.4
通讯作者：
G. Jansson;B. Li;Björn Hannrup
中科院分区：
文献类型：
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作者：
G. Jansson;B. Li;Björn Hannrup
以13个樟子松为材料，用来估计遗传参数的时间趋势和亲本选择的最佳年龄的数据。瑞典南部的后代测试。测量时的最终年龄在24岁到39岁之间，相当于瑞典南部轮换年龄的大约一半。每一次测试中的树高都被测量了4-6次，树龄从5岁到39岁不等。单株树高的遗传力平均为0.16，并随着时间的推移略有增加，尽管不同测试之间存在差异。身高的平均加性变异系数(CVA)为6.0%，平均非加性变异系数(CVD)为3.8%，随年龄的增加呈下降趋势。基于测量时两个年龄之比的自然对数的模型被用来预测遗传年龄-年龄相关性。在一项以30岁时身高为目标性状的分析中，也检验了早期选择的效率。根据单位时间增重进行亲本选择的最佳年龄为11岁，选育的时间间隔为10年。在南部测试中，峰值出现的时间比北部测试早了几年。以现值为基础，利率为5%的选择效率在11年时最佳。
Data used to estimate time trends in genetic parameters and the optimal age for parental selection were obtained from 13 Scots pine (Pinus sylvestris L.) progeny tests in southern Sweden. The final age at measurement was between 24 and 39 yr, corresponding to approximately half the rotation age in southern Sweden. Trees in each test have been measured for height 4–6 times, covering ages from 5 to 39 yr. Individual tree heritability for height averaged 0.16, and increased slightly over time, although there were differences among tests. The average additive coefficient of variation for height (CVA), which decreased with age, was 6.0% while the average nonadditive coefficient of variation (CVD) was 3.8% and did not show any significant trend over time. A model based on the natural logarithm of the ratio between the two ages at measurement was used to predict genetic age-age correlations. The efficiency of early selection was also examined, in an analysis considering total height at age 30 as the target trait. The optimal age for parental selection based on gain per unit time peaked at 11 yr, with a time lag for breeding of 10 yr. In the southern tests, the peak came some years earlier than in the northern tests. Selection efficiency based on present value with an interest rate of 5% showed the optimum at 11 yr.