Ozone risk assessment for plants: central role of metabolism-dependent changes in reducing power.
The combination of stomatal-dependent ozone flux and total ascorbate level is currently presented as a correct indicator for determining the degree of sensitivity of plants to ozone. However, the large changes in carbon metabolism could play a central role in the strategy of the foliar cells in response to chronic ozone exposure, participating in the supply of reducing power and carbon skeletons for repair and detoxification, and modifying the stomatal mode of functioning. To reinforce the accuracy of the definition of the threshold for ozone risk assessment, it is proposed to also consider the redox pool (NAD(P)H), the ratio between carboxylases and the water use efficiency as indicators of the differential ozone tolerance of plants.
Dizengremel
Pierre
P
Faculté des Sciences et Techniques, UMR1137 Ecologie et Ecophysiologie Forestières, Nancy-Université, BP239, F-54506 Vandoeuvre-lès-Nancy Cedex, France. pierre.dizengremel@scbiol.uhp-nancy.fr
Le Thiec
Didier
D
Bagard
Matthieu
M
Jolivet
Yves
Y
D002244:Carbon / Q000378:metabolism; D008658:Inactivation, Metabolic; D010083:Oxidants, Photochemical / Q000493:pharmacokinetics / Q000494:pharmacology*; D010084:Oxidation-Reduction / Q000187:drug effects; D010126:Ozone / Q000493:pharmacokinetics / Q000494:pharmacology*; D018515:Plant Leaves / Q000378:metabolism; D018526:Plant Transpiration / Q000187:drug effects; D010944:Plants / Q000187:drug effects* / Q000378:metabolism; D018570:Risk Assessment; D014867:Water / Q000378:metabolism
D010083:Oxidants, Photochemical; D014867:Water; D010126:Ozone; D002244:Carbon