Magnetic Resonance Imaging Techniques for Visualization of Root Growth and Root Water Uptake Processes

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*Title:*	Main Title: Magnetic Resonance Imaging Techniques for Visualization of Root Growth and Root Water Uptake Processes
*Description:*	Abstract: Root growth and water uptake processes in the subsurface are hard to observe due to the opaque nature of soil. Classical methods are either invasive or restricted to model setups like two-dimensional rhizoboxes and transparent media. Therefore, during the past two decades, non-invasive methods for monitoring root-soil processes have become popular. Among these, Magnetic Resonance Imaging (MRI) is the most versatile one. It allows one to visualize root features like anatomy and root system architecture, water content distribution in the surrounding soil, and tracer movements in soil and roots. In this article, the principles of MRI are introduced first, followed by a short description of necessary hardware components. The third section reviews investigations of root systems and water uptake patterns in soils using MRI and discusses the effect of experimental parameters. In the fourth section, the usage of contrast agents for the investigation of root water processes is demonstrated. This also includes recent own results on the visualization of transport processes in root soil systems using GdDTPA as MRI contrast agent. At the example of maize (Zea Mays L.) and lupin (Lupinus albus L.) in natural sand we can show that this tracer is enriched in the cortex region under high transpiration rate conditions, but is also transported upward. The fifth section is an outlook to special MRI methods for a direct determination of flow velocities and MRI sequences with ultra-short detection time which are convenient for water content determination in porous media with fast relaxation times like soils with high clay contents.
*Identifier:*	10.2136/sssaspecpub61.c7 (DOI)

Responsible Party

*Creators:*	Andreas Pohlmeier (Author), Sabina Haber-Pohlmeier (Author), Mathieu Javaux (Author), Harry Vereecken (Author)
*Publisher:*	Soil Science Society of America
*Publication Year:*	2014

Topic

*TR32 Topic:*	Soil
*Related Subproject:*	A1
*Subjects:*	Keywords: RWU, MRI, Water, Root Growth

File Details

*Filename:*	Pohlmeier_et_al_SSSA_2013.pdf
*Data Type:*	Text - Book Section
*Size:*	20 Pages
*File Size:*	4.7 MB
*Date:*	Available: 30.07.2013
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	According to the TR32DB data policy agreement.
*Access Limitations:*	According to the TR32DB data policy agreement.
*Licence:*	[TR32DB] Data policy agreement

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Specific Information - Publication

*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Book Section
*Book Title:*	Soil–Water–Root Processes: Advances in Tomography and Imaging
*Editors:*	Stephen H. Anderson, Jan W. Hopmans
*City:*	Madison
*Chapter:*	7
*Number of Pages:*	20 (135 - 154)

Metadata Details

*Metadata Creator:*	Tanja Kramm
*Metadata Created:*	18.09.2014
*Metadata Last Updated:*	11.05.2021
*Subproject:*	A1
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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