Document Detail

Factors controlling plasticity of leaf morphology in Robinia pseudoacacia: Biophysical constraints on leaf expansion under long-term water stress.
MedLine Citation:
PMID:  21848653     Owner:  NLM     Status:  Publisher    
In this paper we measured the relative growth rate (RGR) of leaves of Robinia pseudoacacia seedlings under well-watered and water-stressed conditions (mid-day Ψ(w) = leaf water potential estimated with a pressure bomb of -0.48 and -0.98 MPa, respectively). Pressure-volume (PV) curves were done on growing leaves at 25%, 50% and 95% of the mature size (growth stage) in order to compute solute potential (Ψ(π) ) and turgor pressure (Ψ(P) ) as a function of Ψ(w) . The PV curves and diurnal measurements of Ψ(w) and RGR allowed us to evaluate the parameters (cell wall extensibility m and growth turgor threshold Y) of the Lockhart equation, RGR = m(Ψ(P) -Y), at each growth stage. Our data showed that m and Y did change with leaf age, but the changes were slow enough to evaluate m and Y on any given day. We believe this is the first study to provide evidence that the Lockhart equation adequately quantifies leaf growth of trees over a range of time domains. The value of m linearly declined and Y linearly increased with growth stage. Also mild drought stress caused a decline in m and increase in Y relative to controls. Although water stress caused an osmotic adjustment which, in turn, increased Ψ(P) in stressed plants relative to controls, the RGR and final leaf sizes were reduced in water stressed plants because of the impact of water stress on decreased m and increased Y.
Yanxiang Zhang; Maria Alejandra Equiza; Quanshui Zheng; Melvin T Tyree
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-17
Journal Detail:
Title:  Physiologia plantarum     Volume:  -     ISSN:  1399-3054     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © Physiologia Plantarum 2011.
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China Department of Renewable Resources, 444 ESB, University of Alberta, Edmonton, Alberta, Canada T6G 2E3 Northern Research Station, U.S. Forest Service, 705 Spear St., S. Burlington, Vermont, USA 05403.
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