title: Productivity, leaf traits and carbon isotope discrimination in 29 Populus deltoides x P. nigra clones.
abstract: Here we tested whether some leaf traits could be used as predictors for productivity in a range of Populus deltoides x P. nigra clones. These traits were assessed in 3-yr-old rooted cuttings from 29 clones growing in an open field trial, in a five randomized complete block design, under optimal irrigation. Variables were assigned to four groups describing productivity (above-ground biomass, total leaf area), leaf growth (total number of leaves increment rate), leaf structure (area of the largest leaf, specific leaf area, carbon and nitrogen contents), and carbon isotope discrimination in the leaves (Delta). High-yielding clones displayed larger total leaf area and individual leaf area, while no correlation could be detected between productivity and either leaf structure or Delta. By contrast, Delta was negatively correlated with number of leaves increment rate and leaf N content. Our study shows that there is a potential to improve water-use efficiency in poplar without necessarily reducing the overall productivity.
authors.affiliation: Laboratoire de Biologie des Ligneux et des Grandes Cultures, UPRES EA 1207, UFR-Faculté des Sciences, Université d'Orléans, rue de Chartres, BP 6759, 45067 Orléans Cedex 02, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Monclus
authors.forename: Erwin
authors.initials: E
authors.lastname: Dreyer
authors.forename: Francis M
authors.initials: FM
authors.lastname: Delmotte
authors.forename: Marc
authors.initials: M
authors.lastname: Villar
authors.forename: Didier
authors.initials: D
authors.lastname: Delay
authors.forename: Eric
authors.initials: E
authors.lastname: Boudouresque
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Petit
authors.forename: Nicolas
authors.initials: N
authors.lastname: Marron
authors.forename: Claude
authors.initials: C
authors.lastname: Bréchet
authors.forename: Franck
authors.initials: F
authors.lastname: Brignolas
mesh_terms: D002247:Carbon Isotopes / Q000378:metabolism*; D003433:Crosses, Genetic; D018515:Plant Leaves / Q000502:physiology*; D032107:Populus / Q000235:genetics* / Q000502:physiology*; D013997:Time Factors; D014867:Water / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D014867:Water