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@ARTICLE{Pieruschka:61325,
author = {Pieruschka, R. and Chavarría-Krauser, A. and Cloos, K. and
Scharr, H. and Schurr, U. and Jahnke, S.},
title = {{P}hotosynthesis can be enhanced by lateral {CO}2 diffusion
inside leaves over distances of several millimeters},
journal = {The new phytologist},
volume = {178},
issn = {0028-646X},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {PreJuSER-61325},
pages = {335 - 347},
year = {2008},
note = {Record converted from VDB: 12.11.2012},
abstract = {This study examines the extent to which lateral gas
diffusion can influence intercellular CO(2) concentrations
(c(i)) and thus photosynthesis in leaf areas with closed
stomata. Leaves were partly greased to close stomata
artificially, and effects of laterally diffusing CO(2) into
the greased areas were studied by gas-exchange measurement
and chlorophyll fluorescence imaging. Effective quantum
yields (Delta F/F(m)') across the greased areas were
analysed with an image-processing tool and transposed into
c(i) profiles, and lateral CO(2) diffusion coefficients
(D(C'lat)), directly proportional to lateral conductivities
(), were estimated using a one-dimensional (1D) diffusion
model. Effective CO(2) diffusion distances in Vicia faba
(homobaric), Commelina vulgaris (homobaric) and Phaseolus
vulgaris (heterobaric) leaves clearly differed, and were
dependent on D(C'lat), light intensity, [CO(2)], and [O(2)]:
largest distances were approx. 7.0 mm for homobaric leaves
(with high D(C'lat)) and approx. 1.9 mm for heterobaric
leaves (low D(C'lat)). Modeled lateral CO(2) fluxes indicate
large support of photosynthesis over submillimeter distances
for leaves with low D(C'lat), whereas in leaves with large
D(C'lat), photosynthesis can be stimulated over distances of
several millimeters. For the plant species investigated, the
surplus CO(2) assimilation rates of the greased leaf areas
(A(gr)) differed clearly, depending on lateral
conductivities of the respective leaves.},
keywords = {Carbon Dioxide: metabolism / Commelina: metabolism /
Diffusion / Light / Models, Biological / Phaseolus:
metabolism / Photosynthesis: drug effects / Photosystem II
Protein Complex: metabolism / Plant Leaves: metabolism /
Vicia faba: metabolism / Photosystem II Protein Complex (NLM
Chemicals) / Carbon Dioxide (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:18312541},
UT = {WOS:000254385100013},
doi = {10.1111/j.1469-8137.2008.02368.x},
url = {https://juser.fz-juelich.de/record/61325},
}