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Genetic variation in productivity, leaf traits and carbon isotope discrimination in hybrid poplars cultivated on contrasting sites

Abstract : • We examined the relationships between productivity, leaf traits and carbon isotope discrimination in bulk leaf matter (Δl) 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. Δl scaled positively with Δs and neither Δl 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 Δl 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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Ludovic Bonhomme, Cécile Barbaroux, Romain Monclus, Domenico Morabito, Alain Berthelot, et al.. Genetic variation in productivity, leaf traits and carbon isotope discrimination in hybrid poplars cultivated on contrasting sites. Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2008, 65 (5), pp.503(1)-503(9). ⟨10.1051/forest:2008024⟩. ⟨hal-02666445⟩

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