Genetic parameters and genotype x environment interaction in Pinus taeda clonal tests

The present study had the objective of analyze the GxE effects in clonal tests of loblolly pine implanted in the South and Southeast regions of Brazil. For this, 75 clones and three commercial controls were tested using randomized block design, with eight replicates and one plant per plot repeated in four sites. Measurements were performed at 11 years of age and the evaluated traits were: diameter at breast height (dbh), total height and volume. The GGE biplot and the Harmonic Mean of the Relative Performance of Genotypic Values (MHPRVG) methods were used to study GxE effects.本研究旨在分析种植于巴西南部与东南部地区的火炬松无性系试验中的基因型×环境互作（Genotype by Environment Interaction，简称GxE）效应。为此，本试验采用随机区组设计，对75个无性系及3个商业对照品种进行测试，设置8次重复，每小区1株苗木，试验在4个地点重复开展。于苗木11年生时开展性状测定，评估指标包括胸径（diameter at breast height, DBH）、树高及材积。本研究采用GGE双标图以及基因型值相对性能调和均值（Harmonic Mean of the Relative Performance of Genotypic Values，简称MHPRVG）方法分析GxE效应。