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@ARTICLE{Thorpe:56253,
author = {Thorpe, M. R. and Ferrieri, A. P. and Herth, M. M. and
Ferrieri, R. A.},
title = {11{C}-imaging: methyl jasmonate moves in both phloem and
xylem, promotes transport of jasmonate, and of
photoassimilate even after proton transport is decoupled},
journal = {Planta},
volume = {226},
issn = {0032-0935},
address = {Berlin},
publisher = {Springer},
reportid = {PreJuSER-56253},
pages = {541 - 551},
year = {2007},
note = {Record converted from VDB: 12.11.2012},
abstract = {The long-distance transport and actions of the phytohormone
methyl jasmonate (MeJA) were investigated by using the
short-lived positron-emitting isotope 11C to label both MeJA
and photoassimilate, and compare their transport properties
in the same tobacco plants (Nicotiana tabacum L.). There was
strong evidence that MeJA moves in both phloem and xylem
pathways, because MeJA was exported from the labeled region
of a mature leaf in the direction of phloem flow, but it
also moved into other parts of the same leaf and other
mature leaves against the direction of phloem flow. This
suggests that MeJA enters the phloem and moves in sieve tube
sap along with photoassimilate, but that vigorous exchange
between phloem and xylem allows movement in xylem to regions
which are sources of photoassimilate. This exchange may be
enhanced by the volatility of MeJA, which moved readily
between non-orthostichous vascular pathways, unlike reports
for jasmonic acid (which is not volatile). The phloem
loading of MeJA was found to be inhibited by
parachloromercuribenzenesulfonic acid (PCMBS) (a thiol
reagent known to inhibit membrane transporters), and by
protonophores carbonyl cyanide 3-chlorophenylhydrazone
(CCCP) and 2,4-dinitrophenol (DNP) suggesting proton
co-transport. MeJA was found to promote both its own
transport and that of recent photoassimilate within 60 min.
Furthermore, we found that MeJA can counter the inhibitory
effect of the uncoupling agent, CCCP, on sugar transport,
suggesting that MeJA affects the plasma membrane proton
gradient. We also found that MeJA's action may extend to the
sucrose transporter, since MeJA countered the inhibitory
effects of the sulfhydryl reagent, PCMBS, on the transport
of photoassimilate.},
keywords = {2,4-Dinitrophenol: pharmacology /
4-Chloromercuribenzenesulfonate: pharmacology / Acetic
Acids: metabolism / Biological Transport: drug effects /
Carbon Radioisotopes / Carbonyl Cyanide m-Chlorophenyl
Hydrazone: pharmacology / Cyclopentanes: metabolism /
Oxylipins / Phloem: metabolism / Photosynthesis / Tobacco:
drug effects / Tobacco: metabolism / Xylem: metabolism /
Acetic Acids (NLM Chemicals) / Carbon Radioisotopes (NLM
Chemicals) / Cyclopentanes (NLM Chemicals) / Oxylipins (NLM
Chemicals) / methyl jasmonate (NLM Chemicals) /
2,4-Dinitrophenol (NLM Chemicals) /
4-Chloromercuribenzenesulfonate (NLM Chemicals) / Carbonyl
Cyanide m-Chlorophenyl Hydrazone (NLM Chemicals) / jasmonic
acid (NLM Chemicals) / J (WoSType)},
cin = {ICG-3},
ddc = {580},
cid = {I:(DE-Juel1)ICG-3-20090406},
pnm = {Terrestrische Umwelt},
pid = {G:(DE-Juel1)FUEK407},
shelfmark = {Plant Sciences},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:17356850},
UT = {WOS:000247204800022},
doi = {10.1007/s00425-007-0503-5},
url = {https://juser.fz-juelich.de/record/56253},
}