Genetic evaluation, multiple‐trait selection criteria and genetic thinning ofpinus contortavar.latifoliaseed orchards in sweden
作者:
Tore Ericsson,
Öje Danell,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1995)
卷期:
Volume 10,
issue 1-4
页码: 313-325
ISSN:0282-7581
年代: 1995
DOI:10.1080/02827589509382898
出版商: Taylor & Francis Group
关键词: BLUP;breeding value;categorical data;hardiness;economic weight;fungal damage;genetic gain;genetic thinning;Gremmeniellu abietina;half‐sibs;MME;normal scores;open pollination;plus‐tree selection;total‐value selection index
数据来源: Taylor
摘要:
Seedling seed orchards were established in Sweden with 1112 open pollinated progenies ofPinus contortaDouglasexLoudon plus‐trees, selected from 88 wild stands in western Canada. The progenies were also grown in Swedish test plantations. Breeding values (best linear unbiased predictors) were calculated for tree condition, height, and ramicorn whorl frequency, assessed at ages ranging between 8 and 12 yrs. On the harshest sites, damage caused by weather and fungi, e.g.Gremmeniella abietina,were also evaluated. Categorical data were transformed into values on a normal score scale to improve the efficiency of the evaluation. Breeding values for all assessed traits were combined to form total‐value indices. These indices were then used to guide the genetic thinning of the seed orchards, where single trees were selected from groups of four. The genetic gains resulting from the thinning operations on 1010 of the progenies were estimated to range from 2% for the milder utilization areas to 6% for the harshest. It should be possible to double or triple gains by harvesting seed selectively from the five superior families.
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