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Impact of drought on productivity and water use efficiency in 29 genotypes of Populus deltoides x Populus nigra

Abstract : • We examined the relationships among roductivity, water use efficiency (WUE) and drought tolerance in 29 genotypes of Populus × euramericana (Populus deltoides × Populus nigra), and investigated whether some leaf traits could be used as predictors for productivity, WUE and drought tolerance. • At Orléans, France, drought was induced on one field plot by withholding water, while a second plot remained irrigated and was used as a control. Recorded variables included stem traits (e.g. biomass) and leaf structural (e.g. leaf area) and functional traits [e.g. intrinsic water use efficiency (Wi) and carbon isotope discrimination (∆)]. • Productivity and ∆ displayed large genotypic variability and were not correlated. ∆ scaled negatively with Wi and positively with stomatal conductance under moderate drought, suggesting that the diversity for ∆ was mainly driven by stomatal conductance. • Most of the productive genotypes displayed a low level of drought tolerance (i.e. a large reduction of biomass), while the less productive genotypes presented a large range of drought tolerance. The ability to increase WUE in response to water deficit was necessary but not sufficient to explain the genotypic diversity of drought tolerance.
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Submitted on : Sunday, May 31, 2020 - 7:45:03 AM
Last modification on : Monday, November 30, 2020 - 6:54:02 AM

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Romain Monclus, Erwin Dreyer, Marc Villar, Francis Delmotte, Didier Delay, et al.. Impact of drought on productivity and water use efficiency in 29 genotypes of Populus deltoides x Populus nigra. New Phytologist, Wiley, 2006, 169 (4), pp.765-777. ⟨10.1111/j.1469-8137.2005.01630.x⟩. ⟨hal-02665985⟩

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