Leaf Stomatal Conductance and Photosynthesis of Field-grown Maize Exposed to Changing Ozone Concentrations
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Abstract
The impacts of moderate oz
one levels on leaf conduct
ance and photosynthesis of
maize were assessed from field fumigation expe
riments carried out at
Grignon (France) in
july-august 2011. The expo
sition of the plants
to ozone was achieved by
a linear fumigation
device. Continuous measurements
of ozone concentration were
taken inside th
e vegetation,
close to the ears. The
mean daylight ozone le
vels ranged from 31 ppb
(control) to 59 ppb.
Although photosynthesi
s was significantly affected
by long-term oz
one exposure,
stomatal conductance appear
ed to be moderately sensitive
to this pollutant
. Furthermore,
grain yields
were very slightly impa
cted. A Jarvis-type model
of stomatal conductance was
used in order to establish an
empirical relationship between stomatal uptake of ozone and
photosynthetic
capacity