There are many studies describing the physical and anatomical properties of eucalypt wood, but studies comparing the performance of diploid and polyploid clones in terms of wood anatomy and wood quality are scarce. In this context, this study aimed to compare the performances of Eucalyptus diploid and polyploid clones with the same genetic origin by analyzing the physical and anatomical properties of the wood to extend the information on wood quality for pulp and paper production. Woods samples from eucalypt hybrids ( E. grandis x E. urophylla ) from experimental plantations of Suzano S.A. were used. Moisture content, basic density and fiber size were determined. The data related to these variables were tested by analysis of variance. Moisture content in polyploids was 4% higher than in diploids. The mean basic density in diploid clones was 13% higher than in polyploid clones, although there was no significant difference between one of the evaluated clones. The mean fiber length in polyploid clones was 18% higher than in diploid clones. No significant differences were found in the wood quality indexes for cellulosic pulp production. Synthetic polyploid clones of eucalypt presented lower basic density and fibers with higher length and wall thickness when compared to diploids, indicating the potential use of polyploids in eucalypt pulp and paper production.

中文翻译：

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多倍体作为提高桉木工业质量的策略

有许多研究描述了桉木的物理和解剖学特性，但在木材解剖学和木材质量方面比较二倍体和多倍体克隆性能的研究很少。在此背景下，本研究旨在通过分析木材的物理和解剖特性来比较具有相同遗传来源的桉树二倍体和多倍体无性系的性能，以扩展有关纸浆和造纸生产木材质量的信息。使用来自 Suzano SA 实验种植园的桉树杂交种 (E. grandis x E. urophylla) 的木材样品。测定水分含量、基本密度和纤维尺寸。与这些变量相关的数据通过方差分析进行检验。多倍体中的水分含量比二倍体高 4%。二倍体克隆的平均基本密度比多倍体克隆高 13%，尽管评估的克隆之一之间没有显着差异。多倍体克隆的平均纤维长度比二倍体克隆高 18%。纤维素纸浆生产的木材质量指标没有发现显着差异。与二倍体相比，桉树的合成多倍体克隆具有更低的基本密度和纤维，具有更高的长度和壁厚，表明多倍体在桉树纸浆和造纸生产中的潜在用途。