Abstract The selection of ideotypes combining high biomass production, high water use efficiency (WUE) and adequate wood properties is a major challenge in improving forest trees for industrial plantations. This issue was addressed in a field experiment evaluating 1130 clones of Eucalyptus urophylla * Eucalyptus grandis. Genomic selection using 3303 SNPs and the GBLUP model was carried out at age 55 months to select genitors and clones for stem volume (V55), WUE (using stable carbon isotope composition in stemwood, δ13C as a proxy, transformed into intrinsic WUE, Wi), as well as lignin (KL) and holocellulose (HCEL) contents. The variance components were mainly additive for δ13C(Wi), KL and HCEL, while they were highly non-additive for V55 (the ratio of dominance to additive variance was 130%). The narrow sense heritability was higher for Wi (h2 = 0.704) than for volume and wood traits (

中文翻译：

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在桉树育种计划中通过基因组选择来选择水分利用效率、木材化学特性和生物量

摘要 选择结合高生物量生产、高水分利用效率 (WUE) 和适当木材特性的理想型是改善工业人工林林木的主要挑战。此问题已在评估 1130 个 Eucalyptus urophylla * Eucalyptus grandis 克隆的田间实验中得到解决。使用 3303 个 SNP 和 GBLUP 模型在 55 个月龄时进行基因组选择，以选择茎体积 (V55)、WUE（使用茎材中稳定的碳同位素组成，δ13C 作为代理，转化为内在 WUE，Wi）的生殖细胞和克隆，以及木质素 (KL) 和全纤维素 (HCEL) 含量。δ13​​C(Wi)、KL 和 HCEL 的方差分量主要是可加性的，而 V55 的方差分量是高度非可加性的（优势与加性方差的比率为 130%）。