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Genetic variation in productivity, leaf traits and carbon isotope discrimination in hybrid poplars cultivated on contrasting sites
Variation génétique de la productivité, de caractères foliaires et de la discrimination isotopique vis-à-vis du carbone chez des hybrides de peuplier cultivés sur des sites contrastés
Annals of Forest Science volume 65, page 503 (2008)
Abstract
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• We examined the relationships between productivity, leaf traits and carbon isotope discrimination in bulk leaf matter (Δ1) and in phloem sap (Δs) from more than 5-year-old trees belonging to Populus deltoides × P. nigra and Populus trichocarpa × P. deltoides; trees were grown in alluvial and non alluvial sites in a commercial poplar plantation.
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• On both sites, a large genetic variability was evidenced for all variables. The genotypic ranking remained stable between years for all variables, while it differed between sites. Δ1 scaled positively with Δs and neither Δ1 nor Δs were correlated with productivity. A significant genotype by site interaction was evident for all variables. The non alluvial site resulted in lower productivity, and in thicker/denser leaves with lower nitrogen and carbon contents. Noteworthy, the genotypic ranking for Δ1 measured at the alluvial site was similar to that previously established in a glasshouse.
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• As observed in previous studies from younger trees, there is a potential to select genotypes, combining high productivity and high water-use efficiency, for growth in moderately drought-prone areas.
Résumé
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• La productivité, des caractères foliaires et la discrimination isotopique vis-à-vis du carbone de la matière organique des feuilles (Δ1) et de la sève élaborée (Δs) ont été étudiés chez Populus deltoides × P. nigra et Populus trichocarpa × P. deltoides à partir d’arbres âgés de plus de cinq ans, cultivés en peupleraie sur des sites alluviaux et non alluviaux.
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• Des différences génotypiques ont été observées pour toutes les variables. Le classement des génotypes était conservé entre deux années, alors qu’il variait entre sites une année donnée. Δ1 était corrélé positivement avec Δs et aucun lien n’a été détecté entre Δ1 ou Δs et productivité. Une interaction significative entre génotype et site a été observée pour toutes les variables. Les arbres du site non alluvial se caractérisaient par une plus faible productivité et des feuilles plus épaisses/denses avec des teneurs en azote et en carbone plus faibles. De façon intéressante, le classement des génotypes pour Δ1 était maintenu entre les expériences réalisées sur site alluvial et celles précédemment menées en serre.
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• Toutes expériences confondues, il semble possible de sélectionner des génotypes productifs et efficients afin d’étendre les plantations à des terrains enclins à des sécheresses modérées.
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In memoriam (September 2006).
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Bonhomme, L., Barbaroux, C., Monclus, R. et al. Genetic variation in productivity, leaf traits and carbon isotope discrimination in hybrid poplars cultivated on contrasting sites. Ann. For. Sci. 65, 503 (2008). https://doi.org/10.1051/forest:2008024
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DOI: https://doi.org/10.1051/forest:2008024