NDLI: Leaf gas exchange and water potential responses to drought in nine poplar (Populus spp.) clones with contrasting drought tolerance

Content Provider	Springer Nature Link
Author	Silim, S. Nash, R. Reynard, D. White, B. Schroeder, W.
Copyright Year	2009
Abstract	The dynamic responses of stomatal conductance (g s) net photosynthesis (A) and leaf water potential (Ψleaf) to a progressive drought were examined in nine poplar clones (Populus spp.) with contrasting drought tolerance from the Canadian Prairies, a region prone to frequent droughts. Plants were grown in a greenhouse and either well-watered or drought preconditioned (5–6 cycles of drought) for 8 weeks. At the end of the last cycle, plants were watered to saturation then progressively dried-down (−1.25 MPa Ψsoil) during which A, g s and Ψleaf were measured. Drought tolerant Okanese reached the lowest combined Ψleaf while sensitive clones (Assiniboine and Imperial) had the highest (−1.6 vs. −1.1 MPa). Steady state g s (measured under well watered conditions) was lower in tolerant (Okanese and Tristis SBC#1) than in sensitive clones. Preconditioning reduced steady state g s in all clones, lowered the threshold Ψleaf for stomatal closure and the minimum Ψleaf in most clones but did not affect the steady state A. Tolerant and some moderately tolerant clones maintained higher A at lower Ψleaf than the other clones. Stomatal closure was gradual in tolerant clones and in moderately tolerant Northwest but rapid in the other clones. Stomata in the sensitive clones closed at the highest Ψleaf, Okanese closed at the lowest. The substantial range in gas exchange and Ψleaf responses observed here represented both drought tolerance and taxonomic (Aegiros or Tacamahaca sections) traits which could play a role in the survival and productivity in environments with limited water or during periods of drought.
Starting Page	959
Ending Page	969
Page Count	11
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	23
Issue Number	5
e-ISSN	14322285
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-05-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poplar clones Drought tolerance Leaf water potential Photosynthesis Stomatal conductance Plant Physiology Plant Pathology Plant Anatomy/Development Agriculture Plant Sciences Forestry
Content Type	Text
Resource Type	Book Review
Subject	Ecology Physiology Plant Science Forestry

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