Document Detail

Non-destructive estimation of root pressure using sap flow, stem diameter measurements and mechanistic modelling.
MedLine Citation:
PMID:  23211757     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Upward water movement in plants via the xylem is generally attributed to the cohesion-tension theory, as a response to transpiration. Under certain environmental conditions, root pressure can also contribute to upward xylem water flow. Although the occurrence of root pressure is widely recognized, ambiguity exists about the exact mechanism behind root pressure, the main influencing factors and the consequences of root pressure. In horticultural crops, such as tomato (Solanum lycopersicum), root pressure is thought to cause cells to burst, and to have an important impact on the marketable yield. Despite the challenges of root pressure research, progress in this area is limited, probably because of difficulties with direct measurement of root pressure, prompting the need for indirect and non-destructive measurement techniques.
METHODS: A new approach to allow non-destructive and non-invasive estimation of root pressure is presented, using continuous measurements of sap flow and stem diameter variation in tomato combined with a mechanistic flow and storage model, based on cohesion-tension principles.
KEY RESULTS: Transpiration-driven sap flow rates are typically inversely related to stem diameter changes; however, this inverse relationship was no longer valid under conditions of low transpiration. This decoupling between sap flow rates and stem diameter variations was mathematically related to root pressure.
CONCLUSIONS: Root pressure can be estimated in a non-destructive, repeatable manner, using only external plant sensors and a mechanistic model.
Tom De Swaef; Jochen Hanssens; Annelies Cornelis; Kathy Steppe
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-12-04
Journal Detail:
Title:  Annals of botany     Volume:  111     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-28     Completed Date:  2013-05-13     Revised Date:  2014-02-04    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  271-82     Citation Subset:  IM    
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MeSH Terms
Biological Transport
Computer Simulation
Lycopersicon esculentum / anatomy & histology,  physiology*
Models, Biological
Plant Roots / anatomy & histology,  physiology*
Plant Stems / anatomy & histology,  physiology*
Plant Transpiration / physiology*
Water / physiology
Xylem / anatomy & histology,  physiology
Reg. No./Substance:

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

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