| Non-destructive estimation of root pressure using sap flow, stem diameter measurements and mechanistic modelling. | |
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MedLine Citation:
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PMID: 23211757 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BackgroundUpward 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.MethodsA 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 ResultsTranspiration-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sap flow rates are typically inversely related to stem diameter changes; however, this inverse relationship was no longer valid under conditions of low transpiration.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.ConclusionsRoot pressure can be estimated in a non-destructive, repeatable manner, using only external plant sensors and a mechanistic model. |
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Authors:
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Tom De Swaef; Jochen Hanssens; Annelies Cornelis; Kathy Steppe |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-12-4 |
Journal Detail:
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Title: Annals of botany Volume: - ISSN: 1095-8290 ISO Abbreviation: Ann. Bot. Publication Date: 2012 Dec |
Date Detail:
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Created Date: 2012-12-5 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372347 Medline TA: Ann Bot Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Faculty of Bioscience Engineering, Department of Applied Ecology and Environmental Biology, Laboratory of Plant Ecology, Ghent University, Coupure links 653, B-9000 Ghent, Belgium. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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