Osborne, Stephanie Alice, Pandey, Divya, Mills, Gina et al. (5 more authors) (2019) New Insights into Leaf Physiological Responses to Ozone for Use in Crop Modelling. Plants. 84. ISSN 2223-7747
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 by the authors. |
Keywords: | ozone; air pollution; wheat; photosynthesis; leaf senescence; crop modelling,Crop modeling,Air pollution,Ozone,Leaf senescence,Photosynthesis,Wheat |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Stockholm Environment Institute at York (York) |
Depositing User: | Pure (York) |
Date Deposited: | 31 May 2019 09:40 |
Last Modified: | 16 Oct 2024 15:43 |
Published Version: | https://doi.org/10.3390/plants8040084 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.3390/plants8040084 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:146753 |
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Description: Osborne et al., (2019) New insights into leaf physiological responses to ozone for use in crop modelling
Licence: CC-BY 2.5