Bolhàr-Nordenkampf & Meister
Follow the clicks and >!Society for the Advancement of Plant sciences
Fin 9.01.2008
University of Vienna
Faculty of
Life Science
Uptake and Action of Ozone in photosynthetic active plant cells
as model for a general Stress response.
O3 Ozone injury
uptake
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“dry deposition”
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Stomata pore
drought stress
Oxidative Burst
Intercellular spaces
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Xanthophyll-Cycle
*click! Protonation, Zeaxanthin>
Glutathione, Ascorbate
Halliwell-Cycle>
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protection>
overload
*
internal free surface area
Cell wall
*
Assimilatory
power
Carbonic anhydratase
Tunnel proteins
CO2
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water from xylem
Photosynthesis
Tocopherol
ß-Carotin
Zeaxanthin>
Sucrose
Plasmalemma
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Electron- and Proton transport
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Phloem
loading
e.g. Starch-Biosynthesis
in tubers, grain filling *click!
In the end all stress factors inhibit CO2 uptake. Than the Calvin Cycle does not need anymore assimilatory
power. In the light a feed back reaction creates reactive oxygen species (ROSINT) at PSI and PSII. If ROSINT
overload the stress compensation capacity, the cell will get destroyed.
M.H. Meister
Society for the Advancement of Plant sciences
H.R. Bolhàr-Nordenkampf
University of Vienna, Faculty of Life Science