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Drought tolerance and plasticity in the invasive knapweed Centaurea stoebe s.l. (Asteraceae): effect of populations stronger than those of cytotype and range.

Authors
  • 1
  • 2
  • 2
  • 1 Department of Biology, Unit of Ecology and Evolution, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland Herbarium and Department of Botany, Charles University in Prague, Benátská 2, CZ-12801 Praha, Czech Republic [email protected] , (Switzerland)
  • 2 Department of Biology, Unit of Ecology and Evolution, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland. , (Switzerland)
Type
Published Article
Journal
Annals of Botany
1095-8290
Publisher
Oxford University Press
Publication Date
Volume
114
Issue
2
Pages
289–299
Identifiers
DOI: 10.1093/aob/mcu105
PMID: 24918204
Source
Medline
Keywords
License
Unknown

Abstract

Above-ground and total biomasses of European tetraploids were slightly less affected by drought than those of European diploids, and 4xEU plants maintained higher levels of stomatal conductance under moderate drought than 4xNA plants, thus supporting the pre-adaptation but not the post-introduction evolution hypothesis. Plasticity indexes for most of the traits were generally higher in 2xEU and 4xNA than in 4xEU plants, but these differences were not or were only marginally significant. Interestingly, the effect of population origin and its interaction with treatment was more important than the effects of geocytotype and range. Population means for the control treatment showed several significant associations either with latitude or some aspect of climatic data, suggesting evolution of local adaptations, especially within the 2xEU and 4xEU geocytotypes.

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