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Adaptive mechanisms and genomic plasticity for drought tolerance identified in European black poplar (Populus nigra L.): Adaptatie en genomische plasticiteit voor droogte resistentie bij de Europese zwarte populier (Populus nigra L.)

Research output: Contribution to journalA1: Web of Science-articleResearchpeer-review

Authors

  • Maud Viger
  • Hazel K. Smith
  • David Cohen
  • Jennifer Dewoody
  • Harriet Trewin
  • Catherine Bastien
  • Gail Taylor

External Organisations

  • University of Southampton, Centre for Biological Sciences
  • INRA, Nancy
  • USDA Forest Service, National Forest Genetics Lab, 2480 Carson Road, Placerville, CA 95667, USA;
  • 5INRA, Unité de Recherche Amélioration Génétique et Physiologie Forestières, Orléans

Details

Original languageEnglish
JournalTree physiology
Volume36
Issue number7
Pages (from-to)909-928
ISSN0829-318X
Publication statusPublished - 11-May-2016

Abstract

Summer droughts are likely to increase in frequency and intensity across Europe, yet long-lived trees may have a limited ability to tolerate drought. It is therefore critical that we improve our understanding of phenotypic plasticity to drought in natural populations for ecologically and economically important trees such as Populus nigra L. A common garden experiment was conducted using ∼500 wild P. nigra trees, collected from 11 river populations across Europe. Phenotypic variation was found across the collection, with southern genotypes from Spain and France characterized by small leaves and limited biomass production. To examine the relationship between phenotypic variation and drought tolerance, six genotypes with contrasting leaf morphologies were subjected to a water deficit experiment. ‘North eastern’ genotypes were collected at wet sites and responded to water deficit with reduced biomass growth, slow stomatal closure and reduced water use efficiency (WUE) assessed by Δ13C. In contrast, ‘southern’ genotypes originating from arid sites showed rapid stomatal closure, improved WUE and limited leaf loss. Transcriptome analyses of a genotype from Spain (Sp2, originating from an arid site) and another from northern Italy (Ita, originating from a wet site) revealed dramatic differences in gene expression response to water deficit. Transcripts controlling leaf development and stomatal patterning, including SPCH, ANT, ER, AS1, AS2, PHB, CLV1, ERL1–3 and TMM, were down-regulated in Ita but not in Sp2 in response to drought.

EWI Biomedical sciences

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