A global meta-analysis of Water Use Efficiency proxies reveals that UV radiation decreases transpiration without improving WUE

A global meta-analysis of Water Use Efficiency proxies reveals that UV radiation decreases transpiration without improving WUE | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL Plant, Cell & Environment This is a preprint and has not been peer reviewed. Data may be preliminary. 21 February 2025 V1 Latest version Share on A global meta-analysis of Water Use Efficiency proxies reveals that UV radiation decreases transpiration without improving WUE Authors : Marcel A.K. Jansen 0000-0003-2014-5859 , Alexander Ac , John Grace , and Otmar Urban 0000-0002-1716-8876 [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.174013076.62254163/v1 Published Plant, Cell & Environment Version of record Peer review timeline 391 views 186 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Plant water use efficiency (WUE) links physiological processes to ecosystem-scale carbon and water cycles, making it a crucial parameter for climate change adaptation modelling. Climate and stratospheric ozone dynamics expose plants to varying intensity of ultraviolet‐B radiation (UV-B), which affects stomatal function and transpiration. This meta-analysis evaluates UV-B effects on WUE using gas exchange and isotopic proxies. While UV-B radiation reduces stomatal conductance and transpiration, it also suppresses photosynthesis, particularly under non-saturating light. As a result, WUE remains unchanged or declines in UV-B exposed plants, depending on the measurement method. Instantaneous gas exchange-based WUE proxies indicate a decrease, whereas isotope-based proxies, integrating long-term fluxes, show no significant UV-B effect. Notably, UV-B suppresses photosynthesis only in studies using supplemental UV radiation, while UV exclusion in field settings has no significant impact on WUE. Some field studies even report improved WUE under ambient UV-B, suggesting potential adaptive benefits. These findings challenge the assumption that UV-B-induced decreases in transpiration enhance WUE. Instead, they highlight a complex interplay between UV radiation, photosynthesis, and stomatal regulation, emphasizing the need to reconsider UV-B’s role in plant water relations under future climate conditions. Supplementary Material File (jansen_uv-wue_pce.docx) Download 1.73 MB Information & Authors Information Version history V1 Version 1 21 February 2025 Peer review timeline Published Plant, Cell & Environment Version of Record 28 May 2025 Published Copyright This work is licensed under a Non Exclusive No Reuse License. Collection Plant, Cell & Environment Keywords photosynthesis stable carbon isotopes stomata ultraviolet radiation water relations Authors Affiliations Marcel A.K. Jansen 0000-0003-2014-5859 Ustav vyzkumu globalni zmeny Akademie ved Ceske republiky View all articles by this author Alexander Ac Ustav vyzkumu globalni zmeny Akademie ved Ceske republiky View all articles by this author John Grace Ustav vyzkumu globalni zmeny Akademie ved Ceske republiky View all articles by this author Otmar Urban 0000-0002-1716-8876 [email protected] Ustav vyzkumu globalni zmeny Akademie ved Ceske republiky View all articles by this author Metrics & Citations Metrics Article Usage 391 views 186 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Marcel A.K. Jansen, Alexander Ac, John Grace, et al. A global meta-analysis of Water Use Efficiency proxies reveals that UV radiation decreases transpiration without improving WUE. Authorea . 21 February 2025. DOI: https://doi.org/10.22541/au.174013076.62254163/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. 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