1. bookVolume 56 (2007): Issue 1-6 (December 2007)
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2509-8934
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22 Feb 2016
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English
Open Access

A Study of Population Variation and Inheritance in Sitka Spruce

Published Online: 14 Oct 2017
Volume & Issue: Volume 56 (2007) - Issue 1-6 (December 2007)
Page range: 36 - 44
Received: 22 Dec 2005
Journal Details
License
Format
Journal
eISSN
2509-8934
First Published
22 Feb 2016
Publication timeframe
1 time per year
Languages
English
Summary

This study investigated the potential benefits to a tree breeding programme of selection based on height in the original ortet population, and on diameter and wood density of grafted-ramets representing the same ortets growing in a clone bank. The trees studied were a large, randomly selected same-aged population of Sitka spruce (Picea sitchensis (Bong.) Carr.) individuals of known origin growing on a single site in North-West Scotland. Estimates of correlated response indicated the value of including ortet height when adjusted for an environmental variable (in this case height above sea level), and grafted-ramet wood density and diameter in the estimation of breeding values. A selection intensity of 1 in 20 for height amongst ortets in the forest or grafted-ramets in the clone bank each gave a correlated increase in mid-rotation diameter of around 6% in the next generation. A similar selection intensity for wood density in the grafted-ramet population would give a 15% increase of wood density in the next generation. The study indicates worthwhile gain can be achieved at the stage of plus-tree selection when moderate single tree heritability is combined with sufficiently high selection intensity.

Keywords

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