Genetic variation in productivity, leaf traits and carbon isotope discrimination in hybrid poplars cultivated on contrasting sites |
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Authors: | Ludovic Bonhomme Cécile Barbaroux Romain Monclus Domenico Morabito Alain Berthelot Marc Villar Erwin Dreyer Franck Brignolas |
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Affiliation: | 1. Laboratoire de Biologie des Ligneux et des Grandes Cultures, Université d’Orléans, UFR-Faculté des Sciences, UPRES EA 1207, rue de Chartres, BP 6759, 45067, Orléans Cedex 02, France 2. USC2030 ‘Arbres et Réponses aux Contraintes Hydrique et Environnementales’ (ARCHE), INRA, 45067, Orléans, France 3. UMR1137 INRA-UHP ‘écologie et écophysiologie Forestières’, INRA, Nancy Université, IFR 110 ‘Génomique, écophysiologie et écologie Fonctionnelle’, INRA Nancy, 54280, Champenoux, France 4. FCBA, station Nord-Est, 60 route de Bonnencontre, 21170, Charrey-sur-Sa?ne, France 5. UR ‘Amélioration, Génétique et Physiologie Forestières’, INRA, Ardon, BP 20619, 45166, Olivet Cedex, France
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Abstract: | ? 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. ? 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. ? 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. |
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