Document Detail

Rare pits, large vessels and extreme vulnerability to cavitation in a ring-porous tree species.
MedLine Citation:
PMID:  22150784     Owner:  NLM     Status:  Publisher    
• The rare pit hypothesis predicts that the extensive inter-vessel pitting in large early-wood vessels of ring-porous trees should render many of these vessels extremely vulnerable to cavitation by air-seeding. This prediction was tested in Quercus gambelii. • Cavitation was assessed from native hydraulic conductivity at field sap tension and in dehydrated branches. Single-vessel air injections gave air-seeding pressures through vessel files; these data were used to estimate air-seeding pressures for inter-vessel walls and pits. • Extensive cavitation occurred at xylem sap tensions below 1 MPa. Refilling occurred below 0.5 MPa and was inhibited by phloem girdling. Remaining vessels cavitated over a wide range to above 4 MPa. Similarly, 40% of injected vessel files air-seeded below 1.0 MPa, whereas the remainder seeded over a wide range exceeding 5 MPa. Inter-vessel walls averaged 1.02 MPa air-seeding pressure, similar and opposite to the mean cavitation tension of 1.22 MPa. Consistent with the rare pit hypothesis, only 7% of inter-vessel pits were estimated to air-seed by 1.22 MPa. • The results confirm the rare pit prediction that a significant fraction of large vessels in Q. gambelii experience high probability of failure by air-seeding.
Mairgareth A Christman; John S Sperry; Duncan D Smith
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-7
Journal Detail:
Title:  The New phytologist     Volume:  -     ISSN:  1469-8137     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust.
Institute for Ecohydrology Research, 1111 Kennedy Place Ste 4, Davis, CA 95616, USA Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, UT 84112, USA.
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