20年生马尾松半同胞子代生长和产脂力遗传变异及指数选择

摘要

In July 2011, determinations were carried out on height,DBH and volume of 20-yearPinus massoniana of 48 half-sib families and 5 controls in Nanning, Guangxi Zhuang Autonomous Region, and from August to December of the same year, resin tapping was implemented. Analysis demonstrated that height,DBH, volume and resin yield had significant genetic differences among families, with variable coefficient of 5.28%, 8.33%, 12.41% and 4.71%, and heritability of 0.524, 0.607, 0.585 and 0.468. Correlation analysis on different traits indicated that it had significant phenotypic and genetic correlation among growth and resin yield. Improvement ofDBH had obvious effect on resin yield, indicating significant positive correlation between them. Index equation with growth traits and resin yield calculated 10 superior families. Their mean genetic gain of resin yield was 23.92%.%以20年生马尾松Pinus massoniana半同胞子代采脂林为研究对象,分析其生长性状、产脂性状的变异并进行指数选择研究.结果表明,树高、胸径、材积、产脂力在家系间存在极显著(P<0.01)的遗传差异,其遗传变异系数分别为5.28%,8.33%,12.41%和4.71%;家系遗传力分别为0.524,0.607,0.585和0.468.各性状间相关分析结果表明,生长性状和产脂性状间存在显著(P<0.05)的表型、遗传相关,胸径性状的改良对产脂性状的间接改良效果明显,两者间存在极显著(P<0.01)遗传正向相关关系.利用生长性状、产脂性状构建的指数选择方程,选择出10个高产脂优良家系,其平均产脂力遗传增益为23.92%.分析结果表明运用指数法对林木的多性状综合选择及定向选择是可行的.