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@ARTICLE{Gould:35467,
author = {Gould, N. and Minchin, P. E. H. and Thorpe, M. R.},
title = {{D}irect measurement of sieve element hydrostatic pressure
reveal strong regulation of sieve element hydrostatic
pressure after pathway blockage},
journal = {Functional plant biology},
volume = {31},
issn = {1445-4408},
address = {Collingwood, Victoria},
publisher = {CSIRO Publ.},
reportid = {PreJuSER-35467},
pages = {987 - 993},
year = {2004},
note = {Record converted from VDB: 12.11.2012},
abstract = {According to the Munch hypothesis, solution flow through
the phloem is driven by a hydrostatic pressure gradient. At
the source, a high hydrostatic pressure is generated in the
collection phloem by active loading of solutes, which causes
a concomitant passive flow of water, generating a high
turgor pressure. At the sink, solute unloading from the
phloem keeps the turgor pressure low, generating a
source-to-sink hydrostatic pressure gradient. Localised
changes in loading and unloading of solutes along the length
of the transport phloem can compensate for small, short-term
changes in phloem loading at the source, and thus, maintain
phloem flow to the sink tissue. We tested directly the
hydrostatic pressure regulation of the sieve tube by
relating changes in sieve tube hydrostatic pressure to
changes in solute flow through the sieve tube. A sudden
phloem blockage was induced ( by localised chilling of a
1-cm length of stem tissue) while sieve-tube-sap osmotic
pressure, sucrose concentration, hydrostatic pressure and
flow of recent photosynthate were observed in vivo both
upstream and downstream of the block. The results are
discussed in relation to the Munch hypothesis of solution
flow, sieve tube hydrostatic pressure regulation and the
mechanism behind the cold-block phenomenon.},
keywords = {J (WoSType)},
cin = {ICG-III},
ddc = {580},
cid = {I:(DE-Juel1)VDB49},
pnm = {Chemie und Dynamik der Geo-Biosphäre},
pid = {G:(DE-Juel1)FUEK257},
shelfmark = {Plant Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000224481200005},
doi = {10.1071/FP04058},
url = {https://juser.fz-juelich.de/record/35467},
}