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MRI links stem water content to stem diameter variations in transpiring trees

Veerle De Schepper UGent, Dagmar van Dusschoten, Paul Copini, Siegfried Jahnke and Kathy Steppe UGent (2012) JOURNAL OF EXPERIMENTAL BOTANY. 63(7). p.2645-2653
abstract
In trees, stem diameter variations are related to changes in stem water content, because internally stored water is depleted and replenished over a day. To confirm this relationship, non-invasive magnetic resonance imaging (MRI) was combined with point dendrometer measurements in three actively transpiring oak (Quercus robur L.) trees. Two of these oak trees were girdled to study the stem increment above the girdling zone. MRI images and micrographs of stem cross-sections revealed a close link between the water distribution and the anatomical features of the stem. Stem tissues with the highest amount of water were physiologically the most active ones, being the youngest differentiating xylem cells, the cambium and the youngest differentiating and conductive phloem cells. Daily changes in stem diameter corresponded well with the simultaneously MRI-measured amount of water, confirming their strong interdependence. MRI images also revealed that the amount of water in the elastic bark tissues, excluding cambium and the youngest phloem, contributed most to the daily stem diameter changes. After bark removal, an additional increase in stem diameter was measured above the girdle. This increase was attributed not only to the cambial production of new cells, but also to swelling of existing bark cells. In conclusion, the comparison of MRI and dendrometer measurements confirmed previous interpretations and applications of dendrometers and illustrates the additional and complementary information MRI can reveal regarding water relations in plants.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
stem diameter changes, stem growth, Quercus robur L., oak, micrograph, MRI, LVDT, Dendrometer, girdling, water, content, xylem, SAP FLOW DYNAMICS, SUGAR-TRANSPORT, DIURNAL CHANGES, RADIUS CHANGES, BEECH TREE, XYLEM FLOW, PHLOEM, LONG, ANATOMY, STORAGE
journal title
JOURNAL OF EXPERIMENTAL BOTANY
J. Exp. Bot.
volume
63
issue
7
pages
2645 - 2653
Web of Science type
Article
Web of Science id
000304052300021
JCR category
PLANT SCIENCES
JCR impact factor
5.242 (2012)
JCR rank
13/193 (2012)
JCR quartile
1 (2012)
ISSN
0022-0957
DOI
10.1093/jxb/err445
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2135563
handle
http://hdl.handle.net/1854/LU-2135563
date created
2012-06-07 10:17:40
date last changed
2012-06-21 14:26:13
@article{2135563,
  abstract     = {In trees, stem diameter variations are related to changes in stem water content, because internally stored water is depleted and replenished over a day. To confirm this relationship, non-invasive magnetic resonance imaging (MRI) was combined with point dendrometer measurements in three actively transpiring oak (Quercus robur L.) trees. Two of these oak trees were girdled to study the stem increment above the girdling zone. MRI images and micrographs of stem cross-sections revealed a close link between the water distribution and the anatomical features of the stem. Stem tissues with the highest amount of water were physiologically the most active ones, being the youngest differentiating xylem cells, the cambium and the youngest differentiating and conductive phloem cells. Daily changes in stem diameter corresponded well with the simultaneously MRI-measured amount of water, confirming their strong interdependence. MRI images also revealed that the amount of water in the elastic bark tissues, excluding cambium and the youngest phloem, contributed most to the daily stem diameter changes. After bark removal, an additional increase in stem diameter was measured above the girdle. This increase was attributed not only to the cambial production of new cells, but also to swelling of existing bark cells. In conclusion, the comparison of MRI and dendrometer measurements confirmed previous interpretations and applications of dendrometers and illustrates the additional and complementary information MRI can reveal regarding water relations in plants.},
  author       = {De Schepper, Veerle and van Dusschoten, Dagmar and Copini, Paul and Jahnke, Siegfried and Steppe, Kathy},
  issn         = {0022-0957},
  journal      = {JOURNAL OF EXPERIMENTAL BOTANY},
  keyword      = {stem diameter changes,stem growth,Quercus robur L.,oak,micrograph,MRI,LVDT,Dendrometer,girdling,water,content,xylem,SAP FLOW DYNAMICS,SUGAR-TRANSPORT,DIURNAL CHANGES,RADIUS CHANGES,BEECH TREE,XYLEM FLOW,PHLOEM,LONG,ANATOMY,STORAGE},
  language     = {eng},
  number       = {7},
  pages        = {2645--2653},
  title        = {MRI links stem water content to stem diameter variations in transpiring trees},
  url          = {http://dx.doi.org/10.1093/jxb/err445},
  volume       = {63},
  year         = {2012},
}

Chicago
De Schepper, Veerle, Dagmar van Dusschoten, Paul Copini, Siegfried Jahnke, and Kathy Steppe. 2012. “MRI Links Stem Water Content to Stem Diameter Variations in Transpiring Trees.” Journal of Experimental Botany 63 (7): 2645–2653.
APA
De Schepper, V., van Dusschoten, D., Copini, P., Jahnke, S., & Steppe, K. (2012). MRI links stem water content to stem diameter variations in transpiring trees. JOURNAL OF EXPERIMENTAL BOTANY, 63(7), 2645–2653.
Vancouver
1.
De Schepper V, van Dusschoten D, Copini P, Jahnke S, Steppe K. MRI links stem water content to stem diameter variations in transpiring trees. JOURNAL OF EXPERIMENTAL BOTANY. 2012;63(7):2645–53.
MLA
De Schepper, Veerle, Dagmar van Dusschoten, Paul Copini, et al. “MRI Links Stem Water Content to Stem Diameter Variations in Transpiring Trees.” JOURNAL OF EXPERIMENTAL BOTANY 63.7 (2012): 2645–2653. Print.