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Assessing genetic variation to improve stem straightness in Eucalyptus globulus

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Blackburn, DP and Hamilton, MG and Harwood, CE and Baker, TG and Potts, BM (2013) Assessing genetic variation to improve stem straightness in Eucalyptus globulus. Annals of Forest Science, 70 (5). pp. 461-470. ISSN 1286-4560

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Abstract

Abstract
& Context Stem straightness is an important trait for growers
and processors of Eucalyptus globulus logs for solid-wood
products.
& Aims The aims of the study were to determine the extent of
genetic variation in stem deviation from straightness in E.
globulus and assess the utility of a six-point subjective scoring
method as a selection criterion for stem straightness.
& Methods Two E. globulus progeny trials, grown under
solid-wood product regimes, were studied. At age 9 years
(post-thinning), stem straightness was measured using both
image analysis and a six-point subjective scale. Diameter at
breast height (DBH; 1.3 m) was measured at both age 5
(pre-thinning) and age 9 years.
& Results Significant additive genetic variation was observed.
Strong, positive and significant additive genetic
correlations were observed between the stem straightness
assessment methods and between DBH at ages 5 and 9 years.
Significant positive genetic correlations were shown between
subjectively scored stem straightness and DBH at both ages 5
and 9 years.
& Conclusion The six-point subjective scoring method is a
cost-effective selection criterion for stem straightness in E.
globulus. The image measurement technique may be applied
where objective estimates of stem straightness are required,
for training purposes and to verify subjective scores.
Keywords Eucalyptus globulus . Heritability . Correlation .
Stem straightness . Image analysis

Item Type: Article
Journal or Publication Title: Annals of Forest Science
Page Range: pp. 461-470
ISSN: 1286-4560
Identification Number - DOI: 10.1007/s13595-013-0277-9
Additional Information:

Copyright 2013 Springer

Date Deposited: 11 Jun 2013 01:55
Last Modified: 18 Nov 2014 04:51
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