Document Detail

Leaf water content and palisade cell size.
MedLine Citation:
PMID:  16539605     Owner:  NLM     Status:  MEDLINE    
The palisade cell sizes in leaves of Eucalyptus pauciflora were estimated in paradermal sections of cryo-fixed leaves imaged in the cryo-scanning electron microscope, as a quantity called the cell area fraction (CAF). Cell sizes were measured in detached leaves as a function of leaf water content, in intact leaves in the field during a day"s transpiration as a function of balance pressure of adjacent leaves, and on leaf disks equilibrated with air of relative humidities from 100 to 58%. Values of CAF ranged from 0.82 at saturation to approx. 0.3 in leaves dried to a relative water content (RWC) of 0.5, and in the field to approx. 0.58 at 15 bar (1.5 MPa) balance pressure. At a CAF of 0.58, the moisture content of the cell walls is in equilibrium with air at 90% relative humidity, which is the estimated relative humidity in the intercellular spaces. It is shown that at this moisture content, the cell walls could be exerting a pressure of approx. 50 bar on the cell contents.
M J Canny; C X Huang
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The New phytologist     Volume:  170     ISSN:  0028-646X     ISO Abbreviation:  New Phytol.     Publication Date:  2006  
Date Detail:
Created Date:  2006-03-16     Completed Date:  2006-05-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  75-85     Citation Subset:  IM    
Ecosystem Dynamics Group, Research School of Biological Sciences, Australian National University, Canberra, ACT 0200, Australia.
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MeSH Terms
Cell Size
Chlorophyll / metabolism
Cryoelectron Microscopy
Electron Transport / physiology
Eucalyptus / cytology*,  metabolism,  ultrastructure
Plant Leaves / cytology*,  metabolism,  ultrastructure
Water / metabolism*
Reg. No./Substance:
1406-65-1/Chlorophyll; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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