ABSTRACT Growth data from 15 progeny trials were analyzed to assess realized and expected genetic gains associated with improved Norway spruce (Picea abies Karst.) stock in southern Finland. The study materials included 257 seedlots originating from 9 wild stands and 17 seed orchards. The measurement data were collected between 22 and 30 years of age. First-generation seed orchard progenies showed a clear superiority over unimproved trees with a realized genetic gain of 8.4% in height growth, 9.0% in diameter growth, and 20.6% in stem volume growth. The respective genetic gains expected from 1.5-generation seed orchards were 12.8%, 13.5% and 36.9%. Stem slenderness and survival did not differ between groups of improved and unimproved trees. The interaction between genetic groups and sites was insignificant for all the traits, suggesting overall robustness of the gains across environments. The results do not include the additional genetic gain due to genetic thinnings and thus, they are likely to underestimate the currently realizing gains from genetically thinned first-generation seed orchards. The results are suggested to be primary information for further studies needed to model growth and yield of genetically improved Norway spruce stands over a full rotation.

中文翻译：

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芬兰南部三分之一轮龄后代试验中遗传改良挪威云杉的表现

摘要 分析了来自 15 个后代试验的生长数据，以评估与芬兰南部改良挪威云杉 (Picea abies Karst.) 种群相关的已实现和预期遗传增益。研究材料包括来自 9 个野生林分和 17 个种子园的 257 个苗圃。测量数据收集于 22 至 30 岁之间。第一代种子果园后代表现出明显优于未改良树木的遗传增益，高度增长 8.4%，直径增长 9.0%，茎体积增长 20.6%。1.5 代种子园的预期遗传收益分别为 12.8%、13.5% 和 36.9%。改良和未改良树木的茎细长和存活率没有差异。对于所有性状，遗传群体和位点之间的相互作用都不显着，表明跨环境收益的整体稳健性。结果不包括由于基因间伐而产生的额外基因增益，因此，他们可能低估了目前通过基因间稀的第一代种子园实现的收益。这些结果被认为是进一步研究的主要信息，需要对经过完整轮作的转基因挪威云杉的生长和产量进行建模。