Genetic evaluation of Pinus taeda clones from somatic embryogenesis and their genotype x environment interaction

Abstract The objective of this study was to evaluate the genotype x environment interaction and to estimate the genetic components of variance and mean using mixed models in early selection of 238 clones of Pinus taeda propagated by somatic embryogenesis. The experiment consisted of a complete blocks design, with 12 replications, with one plant per plot, in four environments, at 1, 3, and 4 years of age. Estimates of heritability and of genetic gains in the evaluated environments showed good prospects for selection of superior genotypes. The effect of genotype x environment interaction was pronounced for all traits investigated. With the simultaneous selection for stability and adaptability, 10% genetic gain was obtained in relation to the mean of the commercial controls. This estimated gain indicates that the somatic embryogenesis technique has been effective in propagation of clones with good productive potential.

摘要：本研究旨在通过混合模型（mixed models）评估基因型×环境互作（genotype x environment interaction）效应，并估算方差与均值的遗传组分，以对238株经体细胞胚发生（somatic embryogenesis）繁殖的火炬松（Pinus taeda）无性系开展早期选择。试验采用完全随机区组设计，设置12次重复，每小区定植1株苗木，在4个环境中分别于树龄1、3、4年进行性状测定。供试环境下的遗传力与遗传增益估算结果显示，筛选优良基因型具备良好应用前景。基因型×环境互作效应对所有调查性状均表现显著。通过兼顾稳定性与适应性的联合选择，相较于商业对照品种的平均表现，可获得10%的遗传增益。该估算增益结果证实，体细胞胚发生技术在繁育具有优良生产潜力的无性系方面成效显著。