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PLANT PHYSIOLOGY , Vol 107, Issue 3 815-825, Copyright © 1995 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
C4 Photosynthesis (The Effects of Leaf Development on the CO2-Concentrating Mechanism and Photorespiration in Maize)
Z. Dai, MSB. Ku and G. E. Edwards
Department of Botany, Washington State University, Pullman, Washington 99164-4238
The effect of O2 on photosynthesis was determined in maize (Zea mays)
leaves at different developmental stages. The optimum level of O2 for
maximum photosynthetic rates was lower in young and senescing tissues (2-5
kPa) than in mature tissue (9 kPa). Inhibition of photosynthesis by
suboptimal levels of O2 may be due to a requirement for functional
mitochondria or to cyclic/pseudocyclic photophosphorylation in
chloroplasts; inhibition by supraoptimal levels of O2 is considered to be
due to photorespiration. Analysis of a range of developmental stages (along
the leaf blade and at different leaf ages and positions) showed that the
degree of inhibition of photosynthesis by supraoptimal levels of O2
increased rapidly once the ribulose-1,5-bisphosphate carboxylase/oxygenase
and chlorophyll contents were below a critical level and was similar to
that of C3 plants. Tissue having a high sensitivity of photosynthesis to O2
may be less effective in concentrating CO2 in the bundle sheath cells due
either to limited function of the C4 cycle or to higher bundle sheath
conductance to CO2. An analysis based on the kinetic properties of
ribulose-1,5-bisphosphate carboxylase/oxygenase was used to predict the
maximum CO2 level concentrated in bundle sheath cells at a given degree of
inhibition of photosynthesis by supraoptimal levels of O2.
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