| 摘要: |
| 【目的】通过对苗期油松生长性状和生物量性状的测定与分析，初步评选出陕西省的油松优良种源和家系。【方法】 采集陕西洛南、黄龙、太白、宁陕、黄陵和富县6个种源地的82株油松自由授粉优树种子，采用完全随机区组设计进行容器育苗试验，测定各家系2年生油松实生苗的株高、地径、主根长、地上部鲜质量和干质量、地下部鲜质量和干质量及侧根数，对测定性状进行方差分析、遗传变异分析、遗传相关分析，并采用综合选择指数评选优良种源和家系。【结果】 所测定的油松实生苗性状在种源内家系间的差异均达极显著水平，同时除主根长外，其余7个性状在种源间的遗传差异也均达极显著水平；家系间油松实生苗的株高、地径、地上部干质量和鲜质量及地下部鲜质量和干质量两两间遗传相关均达到极显著水平，其中地上部和下部干质量、鲜质量4者间遗传相关系数≥0.813；家系间油松实生苗主根长和侧根数的遗传变异系数均较小，分别为7.976%和11.275%；家系间油松实生苗的地上部鲜质量与地上部干质量、地下部鲜质量与地下部干质量的相关遗传力均较大，分别为0.754和0.750，但是均小于其对应的家系遗传力，所以不适宜进行间接选择；运用综合指数选择法评选出17个油松优良家系，所选家系各性状值均明显优于82个家系各性状的平均值。【结论】 洛南种源为陕西油松种子园建设的优选种源；选出了17个油松优良家系。 |
| 关键词: 油松实生苗 家系遗传变异 遗传相关分析 指数选择 |
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| 基金项目:国家林业局推广项目(2006-85) |
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| Genetic variation analysis of seedling characteristics among different provenances and families of Pinus tabulaegormis in Shaanxi Province |
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| Abstract: |
| 【Objective】 The superior provenances and families of Pinus tabulaeformis were selected by the determinartion of growth and biomass characters at seedling stage.【Method】 The open pollinated seeds of 82 P.tabulaeformis families were collected from Luonan,Huanglong,Taibai,Ningshan,Huangling and Fuxian in Shaanxi Province;Seedling cultivation was conducted in container nursery with complete random block design.Height,ground diameter,main root length,shoot fresh weight,shoot dry weight,root fresh weight,root dry weight and the number of side root of 2-year-old seedlings were determined and studied through variance analysis,genetic variation analysis and genetic correlation analysis.And the superior families were selected through the method of comprehensive selection index.【Result】 The study demonstrated that highly significant differences in 7 characters were observed between different provenances,except main root length,while highly significant differences in 8 characters were observed between different families.The genetic correlations were closely related to each character of the families.The coefficients of genetic correlate was more than 0.813 among fresh shoot weight,fresh root weight,dry shoot weight and dry root weight.The coefficients of genetic variation of main root length and the number of side root was lower,which was 7.976% and 11.275% respectively.Correlation heritability between fresh shoot weight and dry shoot weight was high,but lower than family heritability of fresh shoot weight and dry shoot weight,the correlation between fresh root weight and dry root weight was the same,so indirect selection was not taken.17 superior families were selected with index selection,and characters of families selected were superior than the average 82 families.【Conclusion】 Luonan is a superior provenance in Pineseed orchard establishment in Shaanxi province,and 17 families selected are superior families. |
| Key words: seeding of Pinus tabulaeformis family genetic variation genetic correlation analysis index selection |
