Tropospheric ozone as a threat to food security: A case study of winter wheat exposed to ozone under field conditions
CEES Extra seminar by Matthieu Bagard
While its stratospheric layer constitutes an essential protection against harmful UV radiations, ozone (O3) is one of the prominent air pollutants in the troposphere. As a strong oxidant, ozone is a damaging pollutant with significant impacts on human health and the environment. At cell level, ozone causes a range of physiological disorders that overall contribute to reduce biomass growth and grain filling in crops. Hence, tropospheric ozone can be considered as a “hidden threat” to food security that will add to many others in areas of rapidly increasing population. Wheat is one of the most important and most-widely grown crops, but it is also one of the most sensitive to ozone exposure. Current global yield losses due to ozone are estimated to be between 4 - 15% for wheat and are predicted to range from 5 - 26% for the year 2030. Here, we present a case study of two French winter wheat cultivars exposed to elevated ozone under fully open-air field conditions. The analyses of molecular, metabolic and physiological traits were associated to the evaluation of the agronomic performance of the two cultivars in a season-long fumigation experiment. The obtained data will be discussed with respect to the objective of breeding ozone tolerant wheat genotypes.
Université Paris Est Créteil - UMR Bioemco