Document Detail

The hydraulic architecture of Juniperus communis L. ssp. communis: shrubs and trees compared.
MedLine Citation:
PMID:  18657057     Owner:  NLM     Status:  MEDLINE    
Juniperus communis ssp. communis can grow like a shrub or it can develop a tree-like habit. In this study, the hydraulic architecture of these contrasting growth forms was compared. We analysed the hydraulic efficiency (leaf-specific conductivity, k(l); specific conductivity, k(s); Huber value, HV) and the vulnerability to cavitation (the water potential corresponding to a 50% loss of conductivity, Psi(50)), as well as anatomical parameters [mean tracheid diameter, d; mean hydraulic diameter, d(h); cell wall reinforcement (t/b)(h)(2)] of shrub shoots, tree stems and tree branches. Shrub shoots were similar to tree branches (especially to lower branches) in growth form and conductivity (k(l) = 1.93 +/- 0.11 m(2) s(-1) MPa(-1) 10(-7), k(s) = 5.71 +/- 0.19 m(2) s(-1) MPa(-1) 10(-4)), but were similar to tree stems in their vulnerability to cavitation (Psi(50) = -5.81 +/- 0.08 MPa). Tree stems showed extraordinarily high k(l) and k(s) values, and HV increased from the base up. Stem xylem was more vulnerable to cavitation than branch xylem, where Psi(50) increased from lower (Psi(50) = -6.44 +/- 0.19 MPa) to upper branches (Psi(50) = -5.98 +/- 0.13 MPa). Conduit diameters were correlated with k(l) and k(s). Data indicate that differences in hydraulic architecture correspond to changes in growth form. In some aspects, the xylem hydraulics of tree-like Juniperus communis differs from that of other coniferous tree species.
Barbara Beikircher; Stefan Mayr
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-08-20
Journal Detail:
Title:  Plant, cell & environment     Volume:  31     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-27     Completed Date:  2008-11-05     Revised Date:  2014-02-26    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1545-56     Citation Subset:  IM    
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MeSH Terms
Juniperus / anatomy & histology,  physiology*
Models, Biological
Plant Shoots / growth & development*
Plant Transpiration / physiology*
Trees / anatomy & histology,  physiology*
Water / metabolism
Xylem / anatomy & histology,  metabolism
Grant Support
P 18514-B03//Austrian Science Fund FWF
Reg. No./Substance:

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