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@ARTICLE{PEUKE:280599,
author = {PEUKE, ANDREAS D. and WINDT, CAREL and VAN AS, HENK},
title = {{E}ffects of cold-girdling on flows in the transport phloem
in {R}icinus communis: is mass flow inhibited?},
journal = {Plant, cell $\&$ environment},
volume = {29},
number = {1},
issn = {1365-3040},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2016-00367},
pages = {15 - 25},
year = {2006},
abstract = {The effects of cold girdling of the transport phloem at the
hypocotyl of Ricinus communis on solute and water transport
were investigated. Effects on the chemical composition of
saps of phloem and xylem as well as of stem tissue were
studied by conventional techniques and the water flow in the
phloem was investigated by NMR imaging. Cold girdling
reduced the concentration of sucrose but not that of
inorganic solutes or amino acids in phloem saps. The
possibility that cold treatment inhibited the retrieval of
sucrose into the phloem, following leaching from the sieve
tubes along a chemical gradient is discussed. Leaching of
other solutes did not occur, as a result of missing
promoting gradients in stem tissue. Following 3 d of cold
girdling, sugar concentration increased and starch was
synthesized and accumulated in stem tissue above the cold
girdling region and along the cold-treated phloem pathway
due to leaching of sugars from the phloem. Only in the very
first period of cold girdling (< 15–30 min) was mass flow
inhibited, but recovered in the rest of cold treatment
period to values similar to the control period before and
the recovery period after the cold treatment. It is
concluded that cold treatment affected phloem transport
through two independent and reversible processes: (1) a
permanent leaching of sucrose from the phloem stem without
normal retrieval during cold treatment, and (2) a short-term
inhibition of mass flow at the beginning of cold treatment,
possibly involving P proteins. Possible further mechanisms
for reversible inhibition of water flow are discussed.},
cin = {IBG-2},
ddc = {570},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000233808100002},
doi = {10.1111/j.1365-3040.2005.01396.x},
url = {https://juser.fz-juelich.de/record/280599},
}