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Sixth year results from four ash (Fraxinus excelsior) breeding seedling orchards

机译:四个灰(Fraxinus excelsior)育苗果园的第六年结果

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摘要

A series of four ash (Fraxinus excelsior) progeny trials were established as breeding seedling orchards in 1993. The aim was to improve the form and vigour of Britain's second most widely planted broadleaved species. Four sites were planted in England, employing seed from 36 selected mother trees across Great Britain. By 1998 the average height of the trees in the best family, on the best site, was 2.7 m. Tree heights were first measured in 1996 and determined to be highly heritable. In July 1998 they were assessed for diameter at breast height, height, forking, straightness and branching. Analysis confirmed that height growth is strongly heritable with estimates of genetic gain from 2 to 25%. Heritability for height does not appear to be declining and comparisons with 1996 family rankings reveal a very strong consistency at all sites. These results suggest that juvenile-mature correlations may be strong in ash. The extent of branching is strongly heritable, although heritabilities for forking and straightness were much weaker.
机译:1993年,建立了四个灰分(Fraxinus excelsior)后代试验系列,作为育苗果园。其目的是改善英国第二广泛种植的阔叶树种的形态和活力。在英国种植了四个地点,使用了全英国36棵精选母树的种子。到1998年,最佳家庭中最佳地点树木的平均高度为2.7 m。树木的高度在1996年首次测量,并确定为高度遗传。 1998年7月,对他们的乳房高度,身高,分叉,笔直和分支的直径进行了评估。分析证实,身高增长很容易遗传,遗传增益估计为2%至25%。身高的遗传力似乎并未下降,与1996年家庭排名的比较显示,所有地点的一致性都非常强。这些结果表明,灰烬中的幼虫与幼虫的相关性很强。尽管分叉和笔直性的遗传性要弱得多,但分支的程度可强烈遗传。

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