Impact of drought on productivity and water use efficiency in 29 genotypes of Populus deltoides×Populus nigra
Article first published online: 22 DEC 2005
Volume 169, Issue 4, pages 765–777, February 2006
How to Cite
Monclus, R., Dreyer, E., Villar, M., Delmotte, F. M., Delay, D., Petit, J.-M., Barbaroux, C., Le Thiec, D., Bréchet, C. and Brignolas, F. (2006), Impact of drought on productivity and water use efficiency in 29 genotypes of Populus deltoides×Populus nigra. New Phytologist, 169: 765–777. doi: 10.1111/j.1469-8137.2005.01630.x
- Issue published online: 22 DEC 2005
- Article first published online: 22 DEC 2005
- Received: 8 September 2005 Accepted: 31 October 2005
- carbon isotope discrimination (Δ);
- drought tolerance;
- genotypic diversity;
- hybrid poplars;
- leaf traits;
- open field;
- water use efficiency (WUE)
- • We examined the relationships among productivity, 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 (Δ)].
- • Productivity and Δ displayed large genotypic variability and were not correlated. Δ scaled negatively with Wi and positively with stomatal conductance under moderate drought, suggesting that the diversity for Δ 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.