Document Detail

Xylem vulnerability to cavitation can be accurately characterised in species with long vessels using a centrifuge method.
MedLine Citation:
PMID:  23127246     Owner:  NLM     Status:  Publisher    
Vulnerability to cavitation curves describe the decrease in xylem hydraulic conductivity as xylem pressure declines. Several techniques for constructing vulnerability curves use centrifugal force to induce negative xylem pressure in stem or root segments. Centrifuge vulnerability curves constructed for long-vesselled species have been hypothesised to overestimate xylem vulnerability to cavitation due to increased vulnerability of vessels cut open at stem ends that extend to the middle or entirely through segments. We tested two key predictions of this hypothesis: (i) centrifugation induces greater embolism than dehydration in long-vesselled species, and (ii) the proportion of open vessels changes centrifuge vulnerability curves. Centrifuge and dehydration vulnerability curves were compared for a long- and short-vesselled species. The effect of open vessels was tested in four species by comparing centrifuge vulnerability curves for stems of two lengths. Centrifuge and dehydration vulnerability curves agreed well for the long- and short-vesselled species. Centrifuge vulnerability curves constructed using two stem lengths were similar. Also, the distribution of embolism along the length of centrifuged stems matched the theoretical pressure profile induced by centrifugation. We conclude that vulnerability to cavitation can be accurately characterised with vulnerability curves constructed using a centrifuge technique, even in long-vesselled species.
M F Tobin; R B Pratt; A L Jacobsen; M E De Guzman
Related Documents :
10226196 - Prognostic significance of blood pressure variability in essential hypertension.
11712776 - Invest substudies: design and patient characteristics.
3415796 - A computer-assisted diary (cad) for ambulatory blood pressure monitoring.
15599236 - Monitoring antebrachial compartmental pressure in displaced supracondylar elbow fractur...
11244016 - Genetic influences on baroreflex function in normal twins.
11334556 - Comparative effects of beraprost, a stable analogue of prostacyclin, with pge(1), nitro...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-5
Journal Detail:
Title:  Plant biology (Stuttgart, Germany)     Volume:  -     ISSN:  1438-8677     ISO Abbreviation:  Plant Biol (Stuttg)     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101148926     Medline TA:  Plant Biol (Stuttg)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 German Botanical Society and The Royal Botanical Society of the Netherlands.
Department of Biology, California State University, Bakersfield, Bakersfield, CA, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Decreased Activities of Daily Living is a Strong Risk Factor for Liver Injury by Anti-Tuberculosis D...
Next Document:  Bradykinin type 2 receptor -9/-9 genotype is associated with triceps brachii muscle hypertrophy foll...