两地点8年生柏木生长性状家系变异及选择

【目的】揭示柏木生长性状的遗传变异规律，为高阶遗传改良筛选优良种质，选择优良家系，及其区域推广奠定基础。【方法】以营建在浙江省开化县林场(KH)和湖北省太子山林场(TZS)两个试验点的8年生柏木优树子代家系为材料，分析其生长性状的遗传变异，估算其育种值、遗传力等参数。【结果】柏木生长性状(树高、胸径和材积)的遗传变异系数为3.08%～13.93%,其中材积的变异最大。子代家系的树高、胸径和材积在地点间差异显著，TZS点的单株材积高于KH点315.79%,且家系与地点间的交互效应显著。胸径、树高和材积具有显著的家系效应，KH和TZS试验点的家系遗传力变幅分别为0.42～0.61和0.58～0.74。KH和TZS试验点分别以单株材积育种值大于CK的10%和45%为标准，各选出6个优良家系，现实增益分别为33.51%和67.95%。利用独立淘汰法，在KH点和TZS点各筛选优良单株17和12株，材积的遗传增益分别为41.38%和40.92%。【结论】8年生柏木优树子代家系生长性状具有较大的遗传改良潜力，但家系与环境的互作效应显著；通过子代家系的遗传评价有助于种子园建园亲本的再选择和现有种子园的...

Family variation and selection of growth traits of eight-year-old Cupressus funebris in two sites

【Objective】 The aims of this research is to reveal the genetic variation rules of Cupressus funebris growth traits, select the most suitable germplasm for the advanced genetic improvement, and select the most suitable families for regional promotion. 【Method】 For this study, eight-year-old half-sib families of C. funebris grown in the KH and TZS experimental sites were used, the genetic variations of growth traits were analyzed, and the breeding value and heritability were estimated. 【Result】 The genetic variation coefficients of C. funebris growth traits (tree height, diameter at breast height (DBH) and volume) ranged from 3.08%-13.93%, and the variation of volume was the greatest. The tree height, diameter at breast height, and volume of progeny families varied significantly among locations. The individual tree volume at TZS was 315.79% higher than that at KH, and the interaction between families and locations was significant. The tree height, DBH and volume have significant effects on the family. The range of heritability in the KH and TZS test sites was 0.42-0.61 and 0.58-0.74, respectively. Six complementary families were selected from the KH and TZS test sites based on the standard of breeding value per plant volume greater than 10% and 45% of CK, respectively, and the actual gains were 33.51% and 67.95%, respectively. Using the independent elimination method, 17 and 12 individual plus trees were screened at the KH and TZS sites respectively, and the genetic gains of volume were 41.38% and 40.92%, respectively. 【Conclusion】 The growth traits of the eight-year-old half-sib families of C. funebris have great potential for the genetic improvement, but the interaction effect between the family and the environment was significant. The genetic evaluation of the half-sib families was helpful for the re-selection of the parents for the establishment of the seed orchards and the thinning of the existing seed orchards. At the same time, the selected optimum germplasm can be used as breeding parents for high-order genetic improvement.