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Tree Genetics and Genomes

, 12:123

Complex Traits

Abstract

Adverse genetic correlations between growth traits and solid-wood, as well as fiber traits are a concern in conifer breeding programs. To evaluate the impact of selection for growth and solid-wood properties on fiber dimensions, we investigated the inheritance and efficiency of early selection for different wood-fiber traits and their correlations with stem diameter, wood density, modulus of elasticity MOE, and microfibril angle MFA in Norway spruce Picea abies L. The study was based on two large open-pollinated progeny trials established in southern Sweden in 1990 with material from 524 families comprising 5618 trees. Two increment cores were sampled from each tree. Radial variations from pith to bark were determined for rings 3–15 with SilviScan for fiber widths in the radial RFW and tangential TFW direction, fiber wall thickness FWT, and fiber coarseness FC. Fiber length FL was determined for rings 8–11. Heritabilities based on rings 8–11 using joint-site data were moderate to high 0.24–0.51 for all fiber-dimension traits. Heritabilities based on stem cross-sectional averages varied from 0.34 to 0.48 and reached a plateau at rings 6–9. The -age-age- genetic correlations for RFW, TFW, FWT, and FC cross-sectional averages at a particular age with cross-sectional averages at ring 15 reached 0.9 at rings 4–7. Our results indicated a moderate to high positive genetic correlation for density and MOE with FC and FWT, moderate and negative with RFW, and low with TFW and FL. Comparison of several selection scenarios indicated that the highest profitability is reached when diameter and MOE are considered jointly, in which case, the effect on any fiber dimension is negligible. Early selection was highly efficient from ring 5 for RFW and from rings 8–10 for TFW, FWT, and FC.

KeywordsFiber dimensions Age-age correlations Heritability Genetic correlations Early selection Picea abies Norway spruce Communicated by R. Burdon

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Autor: Zhi-Qiang Chen - Bo Karlsson - Tommy Mörling - Lars Olsson - Ewa J. Mellerowicz - Harry X. Wu - Sven-Olof Lundqvist - Ma

Fuente: https://link.springer.com/



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