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Genetic Parameters and Genotype-by-Environment Interactions in Regional Progeny Tests of Pinus taeda L. in the Southern USA
Forest Science ( IF 1.4 ) Pub Date : 2020-12-01 , DOI: 10.1093/forsci/fxaa035
Edwin Lauer 1 , Andrew Sims 2 , Steven McKeand 1 , Fikret Isik 1
Affiliation  

Abstract
Genetic parameters were estimated using a five-series multienvironment trial of Pinus taeda L. in the southern USA. There were 324 half-sib families planted in five test series across 37 locations. A set of six variance/covariance matrices for the genotype-by-environment (G × E) effect for tree height and diameter were compared on the basis of model fit. In single-series analysis, extended factor analytical models provided generally superior model fit to simpler models for both traits; however, in the combined-series analysis, diameter was optimally modeled using simpler variance/covariance structures. A three-way compound term for modeling G × E interactions among and within series yielded substantial improvements in terms of model fit and standard errors of predictions. Heritability of family means ranged between 0.63 and 0.90 for both height and diameter. Average additive genetic correlations among sites were 0.70 and 0.61 for height and diameter, respectively, suggesting the presence of some G × E interaction. Pairs of sites with the lowest additive genetic correlations were located at opposite ends of the latitude range. Latent factor regression revealed a small number of parents with large factor scores that changed ranks significantly between southern and northern environments.


中文翻译:

美国南部taeda ta。L.区域子代测试中的遗传参数和基因型-环境相互作用。

摘要
遗传参数是使用美国南部的Pinus taeda L.的五系列多环境试验估算的。在37个地点的五个测试系列中种植了324个半同胞家庭。在模型拟合的基础上,比较了针对树高和直径的按环境基因型(G × E)效应的一组六个方差/协方差矩阵。在单系列分析中,扩展因子分析模型通常提供优于两个特征的更适合简单模型的模型。但是,在组合系列分析中,使用更简单的方差/协方差结构对直径进行了最佳建模。用于建模G × E的三向复合项系列之间和系列之间的相互作用在模型拟合和预测的标准误差方面产生了实质性的改进。家族的遗传力在高度和直径上都在0.63至0.90之间。位点之间的高度和直径的平均加性遗传相关性分别为0.70和0.61,表明存在一些G × E相互作用。成对遗传相关性最低的位点对位于纬度范围的相对两端。潜在因素回归显示,少数父母的大因素得分在南部和北部环境之间的排名发生了显着变化。
更新日期:2021-02-01
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