New ozone-nitrogen model shows early senescence onset is the primary cause of ozone-induced reduction in grain quality of wheat

Cook, Jo; Brewster, Clare; Hayes, Felicity ORCID: https://orcid.org/0000-0002-1037-5725; Booth, Nathan; Bland, Sam; Pande, Pritha; Thankappan, Samarthia; Pleijel, Håkan; Emberson, Lisa. 2024 New ozone-nitrogen model shows early senescence onset is the primary cause of ozone-induced reduction in grain quality of wheat. EGUsphere, egusphere-2024-1311. https://doi.org/10.5194/egusphere-2024-1311

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Abstract/Summary

Ozone (O3) air pollution is well known to adversely affect both the grain and protein yield of wheat, an important staple crop. This study aims to identify and model the key plant processes influencing the effect of O3 on wheat protein. We modified the DO3SE-Crop model to incorporate nitrogen (N) processes, and parameterised the O3 effect on stem, leaf and grain N using O3 fumigation datasets spanning 3 years and 4 O3 treatments. Our results show the new model captures the O3 effect on grain N concentrations, and anthesis leaf and stem concentration, well. However, the O3 effect on harvest leaf and stem N is exaggerated. Further, a sensitivity analysis revealed that, irrespective of O3 treatment, accelerated senescence onset was the primary plant process affecting grain N. This modelling study therefore demonstrates the capability of the DO3SE-CropN model to simulate processes by which O3 affects N content, and thereby determines that senescence onset is the main driver of O3 reductions in grain protein yield. The implication of the sensitivity analysis is that breeders should focus their efforts on stay-green cultivars that do not experience a protein penalty when developing O3 tolerant lines, to maintain both wheat yield and nutritional quality under O3 exposure.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.5194/egusphere-2024-1311
UKCEH and CEH Sections/Science Areas:	Soils and Land Use (Science Area 2017-)
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
NORA Subject Terms:	Ecology and Environment Agriculture and Soil Science
Date made live:	17 May 2024 09:49 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537454

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