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@ARTICLE{Copini:866875,
author = {Copini, Paul and Vergeldt, Frank J and Fonti, Patrick and
Sass-Klaassen, Ute and den Ouden, Jan and Sterck, Frank and
Decuyper, Mathieu and Gerkema, Edo and Windt, Carel and Van
As, Henk},
title = {{M}agnetic resonance imaging suggests functional role of
previous year vessels and fibres in ring-porous sap flow
resumption},
journal = {Tree physiology},
volume = {39},
number = {6},
issn = {0829-318X},
address = {Victoria, BC},
publisher = {Heron},
reportid = {FZJ-2019-05935},
pages = {1009 - 1018},
year = {2019},
abstract = {Reactivation of axial water flow in ring-porous species is
a complex process related to stem water content and
developmental stage of both earlywood-vessel and leaf
formation. Yet empirical evidence with non-destructive
methods on the dynamics of water flow resumption in relation
to these mechanisms is lacking. Here we combined in vivo
magnetic resonance imaging and wood-anatomical observations
to monitor the dynamic changes in stem water content and
flow during spring reactivation in 4-year-old pedunculate
oaks (Quercus robur L.) saplings. We found that previous
year latewood vessels and current year developing earlywood
vessels form a functional unit for water flow during growth
resumption. During spring reactivation, water flow shifted
from latewood towards the new earlywood, paralleling the
formation of earlywood vessels and leaves. At leaves' full
expansion, volumetric water content of previous rings
drastically decreased due to the near-absence of water in
fibre tissue. We conclude (i) that in ring-porous oak,
latewood vessels play an important hydraulic role for
bridging the transition between old and new water-conducting
vessels and (ii) that fibre and parenchyma provides a place
for water storage.},
cin = {IBG-2},
ddc = {580},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {582 - Plant Science (POF3-582)},
pid = {G:(DE-HGF)POF3-582},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:30896019},
UT = {WOS:000491257600009},
doi = {10.1093/treephys/tpz019},
url = {https://juser.fz-juelich.de/record/866875},
}