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@ARTICLE{Pieruschka:42744,
author = {Pieruschka, R. and Schurr, U. and Jensen, M. and Wolff, W.
F. and Jahnke, S.},
title = {{L}ateral diffusion of {CO}2 from shaded to illuminated
leaf parts affects photosynthesis inside homobaric leaves},
journal = {The new phytologist},
volume = {169},
issn = {0028-646X},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {PreJuSER-42744},
pages = {779 - 788},
year = {2006},
note = {Record converted from VDB: 12.11.2012},
abstract = {Gas exchange is generally regarded to occur between the
leaf interior and ambient air, i.e. in vertical (anticlinal)
directions of leaf blades. However, inside homobaric leaves,
gas movement occurs also in lateral directions. The aim of
the present study was to ascertain whether lateral CO2
diffusion affects leaf photosynthesis when illuminated
leaves are partially shaded. Measurements using gas exchange
and chlorophyll fluorescence imaging techniques were
performed on homobaric leaves of Vicia faba and Nicotiana
tabacum or on heterobaric leaves of Glycine max and
Phaseolus vulgaris. For homobaric leaves, gas exchange
inside a clamp-on leaf chamber was affected by shading the
leaf outside the chamber. The quantum yield of photosystem
II (Phi(PSII)) was highest directly adjacent to a
light/shade border (LSB). Phi(PSII) decreased in the
illuminated leaf parts with distance from the LSB, while the
opposite was observed for nonphotochemical quenching. These
effects became most pronounced at low stomatal conductance.
They were not observed in heterobaric leaves. The results
suggest that plants with homobaric leaves can benefit from
lateral CO2 flux, in particular when stomata are closed
(e.g. under drought stress). This may enhance
photosynthetic, instead of nonphotochemical, processes near
LSBs in such leaves and reduce the photoinhibitory effects
of excess light.},
keywords = {Carbon Dioxide: metabolism / Chlorophyll: analysis /
Diffusion / Fabaceae: anatomy $\&$ histology / Fabaceae:
metabolism / Light / Microscopy, Fluorescence: methods /
Phaseolus: anatomy $\&$ histology / Phaseolus: metabolism /
Photosynthesis: physiology / Plant Leaves: anatomy $\&$
histology / Plant Leaves: metabolism / Soybeans: anatomy
$\&$ histology / Soybeans: metabolism / Tobacco: anatomy
$\&$ histology / Tobacco: metabolism / Vicia faba: anatomy
$\&$ histology / Vicia faba: metabolism / Water: metabolism
/ Carbon Dioxide (NLM Chemicals) / Chlorophyll (NLM
Chemicals) / Water (NLM Chemicals) / J (WoSType)},
cin = {ICG-III / JARA-ENERGY},
ddc = {580},
cid = {I:(DE-Juel1)VDB49 / $I:(DE-82)080011_20140620$},
pnm = {Terrestrische Umwelt},
pid = {G:(DE-Juel1)FUEK407},
shelfmark = {Plant Sciences},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:16441758},
UT = {WOS:000234975800015},
doi = {10.1111/j.1469-8137.2005.01605.x},
url = {https://juser.fz-juelich.de/record/42744},
}