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Genetic information from progeny trials: a comparison between progenies generated by open pollination and by controlled crosses

Hallingbäck, Henrik and Jansson, Gunnar (2013). Genetic information from progeny trials: a comparison between progenies generated by open pollination and by controlled crosses. Tree Genetics and Genomes. 9:3, 731-740
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Official URL: http://dx.doi.org/10.1007/s11295-012-0588-2

Abstract

When conifer progenies generated by open pollination are assessed in field tests, it is usually assumed that all progenies of the same mother are true half-sibs. This assumption may be invalid, leading to overestimation of additive genetic variation and heritability and to biased breeding values. From one Scots pine (Pinus sylvestris) and one Norway spruce (Picea abies) seed orchard, containing 28 and 36 parent clones respectively, progenies generated by open pollination (OP) and by controlled crosses (CC) were planted in adjacent trials at two to three sites in southern Sweden. The tree
height and diameter at breast height were measured and genetic parameters based on these traits were estimated for OP and CC progenies separately, in order to enable comparisons. Narrow sense heritability estimates for Scots pine and Norway spruce OP progenies (in the ranges 0.04–0.13 and 0.15–0.38, respectively) did not differ significantly from CC estimates (0.07–0.12 and 0.23–0.30), suggesting that OP-based heritability values were not overestimated to any great extent. Similarly, genetic correlations between OP and CC progenies were in the ranges 0.87–0.88 and 0.74–0.77 for Scots pine and Norway spruce, respectively, being significantly lower than unity only in the case of Norway spruce. OP-based breeding values for both species should therefore correspond well with those predicted from CC progenies, albeit not perfectly for Norway spruce. In conclusion, the assumption of true half-sibs for OP progenies was not violated to the extent that genetic parameter estimates or breeding value predictions were seriously biased.

Authors/Creators:Hallingbäck, Henrik and Jansson, Gunnar
Title:Genetic information from progeny trials: a comparison between progenies generated by open pollination and by controlled crosses
Series/Journal:Tree Genetics and Genomes (1614-2950)
Year of publishing :2013
Depositing date:4 August 2015
Volume:9
Number:3
Page range:731-740
Publisher:Springer Verlag
ISSN:1614-2950
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
K Forestry > K01 Forestry - General aspects
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Genetics (medical genetics to be 30107 and agricultural genetics to be 40402)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:pinus sylvestris, picea abies, coancestry, genetic parameters, open pollination
Keywords:scots pine, norway spruce, coancestry, genetic parameters, open pollination, controlled crossing
URN:NBN:urn:nbn:se:slu:epsilon-e-2983
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2983
Additional ID:
Type of IDID
DOI10.1007/s11295-012-0588-2
ID Code:12475
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
External funders:Föreningen Skogsträdsförädling
Deposited By: Henrik Hallingbäck
Deposited On:27 Oct 2015 06:47
Metadata Last Modified:15 Dec 2015 08:38

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