New insights into leaf physiological responses to ozone for use in crop modelling

Osborne, Stephanie; Pandey, Divya; Mills, Gina; Hayes, Felicity; Harmens, Harry; Gillies, David; Büker, Patrick; Emberson, Lisa. 2019 New insights into leaf physiological responses to ozone for use in crop modelling [in special issue: Ozone tolerance mechanisms] Plants, 8 (4), 84. 30, pp.

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Estimating food production under future air pollution and climate conditions in scenario analysis depends on accurately modelling ozone (O3) effects on yield. This study tests several assumptions that form part of published approaches for modelling O3 effects on photosynthesis and leaf duration against experimental data. In 2015 and 2016, two wheat cultivars were exposed in eight hemispherical glasshouses to O3 ranging from 22 to 57 ppb (24 h mean), with profiles ranging from raised background to high peak treatments. The stomatal O3 flux (Phytotoxic Ozone Dose, POD) to leaves was simulated using a multiplicative stomatal conductance model. Leaf senescence occurred earlier as average POD increased according to a linear relationship, and the two cultivars showed very different senescence responses. Negative effects of O3 on photosynthesis were only observed alongside O3-induced leaf senescence, suggesting that O3 does not impair photosynthesis in un-senesced flag leaves at the realistic O3 concentrations applied here. Accelerated senescence is therefore likely to be the dominant O3 effect influencing yield in most agricultural environments. POD was better than 24 h mean concentration and AOT40 (accumulated O3 exceeding 40 ppb, daylight hours) at predicting physiological response to O3, and flux also accounted for the difference in exposure resulting from peak and high background treatments.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Soils and Land Use (Science Area 2017-)
UKCEH Fellows
ISSN: 2223-7747
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: ozone, air pollution, wheat, photosynthesis, leaf senescence, crop modelling
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
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Date made live: 09 Apr 2019 15:55 +0 (UTC)

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