Abstract
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• The aim of this study was to investigate the effectiveness of using cellulose content, measured by the diglyme-HCl method, as a selection trait in breeding programs for kraft pulp yield in Eucalyptus urophylla.
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• A total of 275 trees from sixty-two families were sampled from a thinned progeny trial of E. urophylla in northern Vietnam to evaluate cellulose content from breast-height increment cores. Among those, twenty unrelated trees were felled to evaluate cellulose content and pulp yield from breast-height disk samples.
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• The regression of pulp yield of disk samples on cellulose content was strong either from disks (R 2 = 0.83) or increment cores (R 2 = 0.69). There was no significant difference in cellulose content between the provenances. The narrow-sense within-provenance heritability of cellulose content was 0.50 and the coefficient of additive genetic variation was 3.9%. Genetic correlations between cellulose content and growth (0.28–0.45) or wood basic density (−0.02) were not significantly different from zero.
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• Breast-height increment core cellulose content measured by diglyme-HCl method is under strong genetic control and can be used to rank trees for pulp yield in E. urophylla plantations. Selection for increased cellulose content would have only minor effects on growth and wood basic density.
Résumé
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• L’objectif de cette étude était d’étudier l’efficacité de l’utilisation de la teneur en cellulose, mesuré par la méthode diglyme-HCl, comme un trait de sélection dans les programmes d’amélioration du rendement en pâte kraft chez Eucalyptus urophylla.
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• Un total de 275 arbres issus de soixante-deux familles ont été échantillonnés, à partir d’un essai de descendance d’ E. urophylla dans le nord du Vietnam, pour évaluer la teneur en cellulose de carottes d’accroissement prélevées à hauteur de poitrine. Parmi ces arbres, vingt ont été abattus afin d’évaluer la teneur cellulose et le rendement en pâte de disques échantillons, prélevées à hauteur de poitrine.
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• La régression de la production de pâte du disques échantillons a été forte sur la teneur en cellulose, soit à partir des disques (R 2 = 0.83) ou des carottes d’accroissement (R 2 = 0.69). Il n’y a pas de différence significative pour la teneur en cellulose entre les provenances. Le sens restreint dans l’héritabilité intra-provenance de la teneur de la cellulose était 0,50 et le coefficient de variation génétique additive a été de 3,9 %. Les corrélations génétiques entre la teneur en cellulose et la croissance (0,28–0,45) ou l’infra densité du bois (−0,02) ne sont pas significativement différentes de zéro.
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• La teneur en cellulose des carottes d’accroissement mesurée par la méthode diglyme-HCl est sous contrôle génétique fort et peut être utilisée pour classer les arbres pour le rendement en pâte dans les plantations d’E. urophylla. La sélection pour l’augmentation de la teneur en cellulose aurait seulement des effets mineurs sur la croissance et l’infra-densité du bois.
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Kien, N.D., Quang, T.H., Jansson, G. et al. Cellulose content as a selection trait in breeding for kraft pulp yield in Eucalyptus urophylla . Ann. For. Sci. 66, 711 (2009). https://doi.org/10.1051/forest/2009064
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DOI: https://doi.org/10.1051/forest/2009064