中轮龄蓝桉木材特性的遗传变异

IF 1.5 4区 农林科学 Q2 FORESTRY New Zealand Journal of Forestry Science Pub Date : 2022-04-27 DOI:10.33494/nzjfs522022x172x
E. Iyiola, C. Altaner, L. Apiolaza
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引用次数: 0

摘要

背景:Eucalyptus globoidea Blakely生产耐磨性(2级)和硬木,有潜力在新西兰种植,提供高价值的环保木材,用于农业部门的柱子和LVL行业的硬木贴面。新西兰旱地森林倡议(NZDFI)已经为这个物种建立了一个繁殖计划。本研究的目的是鉴定具有优良木材性能的树木,用于商业繁殖,从而建立国内的地面耐用木材种植园资源。方法:对141个圆木科8岁中期木材性状的遗传变异进行了评价,包括:心材直径、~0.5 m高度树皮下直径、复合边材直径、心材塌缩、边材塌缩、立木声速和心材浸出物含量。通过家族排序,鉴定出心材直径大、提取物含量高、硬度高、塌缩率低的基因型。结果:心材直径(h2 = 0.51)和提取物含量(h2 = 1.16)具有良好的遗传力,变异率高,是选育的理想性状。萃取物含量的高遗传率表明种群内的亲缘关系比半兄弟姐妹的不相关家庭的假设更密切。心材直径与提取物含量之间呈负相关(遗传相关(rg) = - 0.45),表明两者的同时改良需要折衷。心材塌陷(h2 = 0.30)和声速(h2 = 0.36)的遗传率估计为中等。结论:对圆木木材品质性状进行遗传选择是切实可行的。在繁殖种群中,多种性状表现高于平均水平的优良个体存在,但这取决于木材的预期最终用途。
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Genetic variation in wood properties of mid-rotation age Eucalyptus globoidea
Background: Eucalyptus globoidea Blakely produces ground-durable (Class 2) and stiff wood and has the potential to be grown in New Zealand to supply high-value environmentally-friendly timber for use as posts in the agricultural sector and stiff veneers for the LVL industry. The New Zealand Dryland Forests Initiative (NZDFI) has established a breeding programme for this species. The objective of this study was to identify trees with superior wood properties for commercial propagation enabling the establishment of a domestic plantation resource of ground-durable timber. Methods: The genetic variation in wood properties at mid-rotation age (8-year-old) of 141 E. globoidea families was assessed for the following traits: heartwood diameter, diameter under bark at ~0.5 m height, combined sapwood diameter, heartwood collapse, sapwood collapse, standing tree acoustic velocity and extractive content in the heartwood. Families were ranked and genotypes with large heartwood diameter, high extractive content and stiffness as well as low collapse were identified. Results: Heartwood diameter (h2 = 0.51) and extractive content (h2 = 1.16) showed good heritability, which in combination with high variation are promising traits for a breeding programme. The high heritability for extractive content indicated a closer relatedness within the population than the assumption of unrelated families of half-siblings. The unfavourable correlation between the heartwood diameter and extractive content (genetic correlation (rg) = −0.45) indicated that a compromise is required for simultaneous improvement of both traits. Heritability estimates for heartwood collapse (h2 = 0.30) and acoustic velocity (h2 = 0.36) were moderate. Conclusions: Genetic selection for wood quality traits of E. globoidea is practically feasible. Superior individuals with above average performance for multiple traits were present in the breeding populations, however, this was dependent on the intended end use of the timber.
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来源期刊
CiteScore
2.20
自引率
13.30%
发文量
20
审稿时长
39 weeks
期刊介绍: The New Zealand Journal of Forestry Science is an international journal covering the breadth of forestry science. Planted forests are a particular focus but manuscripts on a wide range of forestry topics will also be considered. The journal''s scope covers forestry species, which are those capable of reaching at least five metres in height at maturity in the place they are located, but not grown or managed primarily for fruit or nut production.
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