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Quantitative genetics of lodgepole pine (Pinus contorta) wood quality traits in Sweden

Hayatgheibi, Haleh (2018). Quantitative genetics of lodgepole pine (Pinus contorta) wood quality traits in Sweden. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2018:31
ISBN 978-91-7760-202-6
eISBN 978-91-7760-203-3
[Doctoral thesis]

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Stem bending, breakage, and general instability of lodgepole pine has been a major problem in northern Sweden due to low stem stiffness. The overall aim of this thesis was to evaluate the potential incorporation of wood quality traits into lodgepole pine advanced breeding programs. To achieve this, 823 increment cores were sampled from 207 half-sib families at two progeny trials of lodgepole pine and genetic variations in wood density, microfibril angle (MFA), modulus of elasticity (clearwood stiffness; MOEs), radial fibre width (RFW), tangential fibre width (TFW), fibre wall thickness (FWT), and fibre coarseness (FC) were characterised.
To quantify genotype by environment interactions (G × E) for growth and stiffness and to evaluate performance of provenances, diameter at breast height (DBH) and dynamic stiffness of standing trees (MOEtof) were studied, using six 33-36 year-old lodgepole progeny trials within three different breeding zones in northern Sweden. To evaluate genetic gains in selection for an early MFA transition from juvenile to mature wood, six different regression functions were fitted to the MFA profile of each tree to delineate the age variation in MFA transition.
Narrow-sense heritability estimates (ℎ2) ranged from 0.10 to 0.32 for DBH and from 0.18 to 0.76 for wood quality traits. Unfavourable genetic correlations between growth and stiffness were observed, implying that selection for a 1% increase in DBH alone, would confer 5.5% and 2.3% decreases in lodgepole pine MOEs and MOEtof, respectively.
Results of the studies in this thesis indicate that simultaneous improvement of DBH and stiffness is achievable when an optimal selection index combining both traits is implemented. Additionally, it is possible to select for an earlier MFA transition from juvenile to mature wood, and thus, decreasing the proportion of the log containing juvenile wood in lodgepole pine selective breeding programs. Finally, G × E was only significant for stiffness within the northern most breeding zone. To achieve the highest stiffness for lodgepole pine, provenances of Yukon origin should be planted at lower latitudes and those of British Columbia (BC) origin should be planted at lower elevations within the tested breeding zones.

Authors/Creators:Hayatgheibi, Haleh
Title:Quantitative genetics of lodgepole pine (Pinus contorta) wood quality traits in Sweden
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :24 April 2018
Depositing date:24 April 2018
Number of Pages:56
IHaleh Hayatgheibi, Anders Fries, Johan Kroon, and Harry X. Wu* (2017). Genetic analysis of lodgepole pine (Pinus contorta) solid-wood quality traits. Canadian Journal of Forest Research, 47, pp. 1303-1313
IIHaleh Hayatgheibi, Anders Fries, Johan Kroon, and Harry X. Wu*. Genetic analysis of fibre-dimension traits and combined selection for simultaneous improvement of growth and stiffness in lodgepole pine (Pinus contorta) (submitted to Annals of Forest Science)
IIIHaleh Hayatgheibi, Nils Forsberg, Sven-Olof Lundqvist, Tommy Mörling, Ewa J. Mellerowicz, Bo Karlsson, Harry X. Wu, M Rosario García-Gil1*. Genetic control of transition from juvenile to mature wood with respect to microfibril angle (MFA) in Norway spruce (Picea abies) and lodgepole pine (Pinus contorta) (submitted to Canadian Journal of Forest Research)
IVHaleh Hayatgheibi, Anders Fries, Johan Kroon, and Harry X. Wu*. Estimation of genetic parameters, provenance performances, and genotype by environment interactions for growth and stiffness in lodgepole pine (Pinus contorta) (submitted to Scandinavian Journal of Forest Research)
Place of Publication:Umeå
Publisher:Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-202-6
ISBN for electronic version:978-91-7760-203-3
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
F Plant production > F62 Plant physiology - Growth and development
K Forestry > K10 Forestry production
Agrovoc terms:wood properties, quality, genetic parameters, selection index, Pinus contorta, wood density, plant fibres, sweden
Keywords:wood quality traits, genetic parameters, index selection, early selection efficiency, lodgepole pine, G × E interaction, microfibril angle (MFA), transition wood, SilviScan
Permanent URL:
ID Code:15438
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: Haleh Hayatgheibi
Deposited On:25 Apr 2018 07:09
Metadata Last Modified:09 Sep 2020 14:17

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