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@ARTICLE{McQueen:47497,
author = {McQueen, J. C. and Minchin, P. E. H. and Thorpe, M. R. and
Silvester, W. B.},
title = {{S}hort-term storage of carbohydrate in stem tissue of
apple ({M}alus domestica), a woody perennial: evidence for
involvement of the apoplast},
journal = {Functional plant biology},
volume = {32},
issn = {1445-4408},
address = {Collingwood, Victoria},
publisher = {CSIRO Publ.},
reportid = {PreJuSER-47497},
pages = {1027 - 1031},
year = {2005},
note = {Record converted from VDB: 12.11.2012},
abstract = {This work investigates the pathway and mechanism for
lateral retrieval of carbohydrate into the transport phloem
of apple stems ( Malus domestica Borkh.). A heat exchanger
was set up on the stem, allowing rapid chilling and
subsequent re-warming of stem segments while the time course
of axial transport of C-11-labelled photoassimilate was
measured at a position similar to 65 mm downstream of the
heat exchanger. Whenever axial transport was blocked by a
sudden chill at the heat exchanger, transport 65 mm
downstream from the blockage immediately slowed but did not
stop, showing that there was retrieval of solutes into the
pathway ( buffering), within that 65 mm of stem, to help
maintain the axial flow. Use of PCMBS, an inhibitor of sugar
transporters, showed that the buffering included retrieval
of sugar from the apoplast. We concluded that in apple,
apoplastic sugar in stem tissue can buffer phloem transport
during short-term changes in supply and demand for
carbohydrates. Buffering was stronger when mobile reserves
in the stem were higher, for example late in the
photoperiod, or if carbohydrate demand in the terminal sink
was increased. We also suggest that the concentration of
sugars in the apoplast is a regulator of carbohydrate
storage and re-mobilisation.},
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:000232856600006},
doi = {10.1071/FP05082},
url = {https://juser.fz-juelich.de/record/47497},
}