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@ARTICLE{Liesche:280596,
author = {Liesche, J. and Windt, C. and Bohr, T. and Schulz, A. and
Jensen, K. H.},
title = {{S}lower phloem transport in gymnosperm trees can be
attributed to higher sieve element resistance},
journal = {Tree physiology},
volume = {35},
number = {4},
issn = {1758-4469},
address = {Victoria, BC},
publisher = {Heron},
reportid = {FZJ-2016-00364},
pages = {376 - 386},
year = {2015},
abstract = {In trees, carbohydrates produced in photosynthesizing
leaves are transported to roots and other sink organs over
distances of up to 100 m inside a specialized transport
tissue, the phloem. Angiosperm and gymnosperm trees have a
fundamentally different phloem anatomy with respect to cell
size, shape and connectivity. Whether these differences have
an effect on the physiology of carbohydrate transport,
however, is not clear. A meta-analysis of the experimental
data on phloem transport speed in trees yielded average
speeds of 56 cm h−1 for angiosperm trees and
22 cm h−1 for gymnosperm trees. Similar values
resulted from theoretical modeling using a simple transport
resistance model. Analysis of the model parameters clearly
identified sieve element (SE) anatomy as the main factor for
the significantly slower carbohydrate transport speed inside
the phloem in gymnosperm compared with angiosperm trees. In
order to investigate the influence of SE anatomy on the
hydraulic resistance, anatomical data on SEs and sieve pores
were collected by transmission electron microscopy analysis
and from the literature for 18 tree species. Calculations
showed that the hydraulic resistance is significantly higher
in the gymnosperm than in angiosperm trees. The higher
resistance is only partially offset by the considerably
longer SEs of gymnosperms.},
cin = {IBG-2},
ddc = {630},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {582 - Plant Science (POF3-582)},
pid = {G:(DE-HGF)POF3-582},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000354778300005},
pubmed = {pmid:25787331},
doi = {10.1093/treephys/tpv020},
url = {https://juser.fz-juelich.de/record/280596},
}