Genotype by environment interaction for growth and Dothistroma resistance and clonal connectivity between environments in radiata pine in New Zealand and Australia

Twenty-eight clonal trials of radiata pine planted across Australia and New Zealand were used to investigate genetic variation and genotype by environment (G×E) interaction for diameter-at-breast-height (DBH), height and Dothistroma resistance (DO_R). The average narrow-sense heritabilities were 0.11, 0.21 and 0.30 while the average broad-sense heritabilities were 0.27, 0.34 and 0.40 for DBH, height and Dothistroma resistance, respectively. Dothistroma resistance was assessed as the percentage of needles that were not affected by Dothistroma needle blight. G×E interactions were analysed using an approximate reduced factor analytic model. Apparent G×E interactions were estimated for DBH, height and Dothistroma resistance. Estimates of G×E interactions and their standard errors were strongly influenced by the level of connectivity between trials, in terms of common clones and common parents. When there was sufficient connectivity between trials (more than 30% common clones between trials)...本研究采用在澳大利亚及新西兰境内营建的28个辐射松（radiata pine）无性系试验林，对直径胸高（diameter-at-breast-height, DBH）、树高以及松针褐斑病抗性（Dothistroma resistance, DO_R）的遗传变异与基因型-环境（G×E）互作展开研究。胸径、树高与松针褐斑病抗性的平均窄义遗传力分别为0.11、0.21和0.30，平均广义遗传力分别为0.27、0.34和0.40。松针褐斑病抗性以未受松针褐斑病（Dothistroma needle blight）侵染的松针占比进行量化评估。本研究采用近似约化因子分析模型开展G×E互作分析，并对胸径、树高及松针褐斑病抗性的表观G×E互作效应进行了估算。G×E互作及其标准误的估算结果，显著受试验点间基于共享无性系与共享亲本的连通水平影响。当试验点间具备充足连通性（试验点间共享无性系占比超过30%）时……