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Effects of ozone on photosynthetic CO2 exchange, chlorophyll a fluorescence and antioxidant systems in lettuce leaves

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URI
http://hdl.handle.net/20.500.11939/4919
DOI
10.1034/j.1399-3054.2002.1160305.x
Derechos de acceso
openAccess
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Author
Calatayud, Ángeles; Ramirez, J. W.; Iglesias, Domingo J.; Barreno, Eva
Date
2002
Cita bibliográfica
Calatayud, A., Ramirez, J. W., Iglesias, D. J., Barreno, E. (2002). Effects of ozone on photosynthetic CO2 exchange, chlorophyll a fluorescence and antioxidant systems in lettuce leaves. Physiologia Plantarum, 116(3), 308-316.
Abstract
The effects of ozone exposure on lettuce leaves were investigated by means of gas exchange, modulated chlorophyll a fluorescence and antioxidants systems. High ozone concentration decreased the rate of photosynthesis at light saturation level and changes in stomatal conductance and transpiration rate. However, an increase in intercellular CO2 concentration indicated a decrease in the carboxylation efficiency. These data agreed with a reduction of non-cyclic electron flow and lower capacity to reduce the quinone pool. Ozone affected the ascorbate pool and decreased ascorbate peroxidase activity, increased lipid peroxidation, altered membrane properties and reduced the development of non-photochemical quenching.
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