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de Vries, A.* ; Spielmann, F.* ; Hammerle, A.* ; Schmack, J.* ; Jud, W.* ; Karl, T.* ; Schnitzler, J.-P. ; Winkler, J.B. ; Wohlfahrt, G.*

Drought effects on the leaf uptake of carbonyl sulfide and CO2 in Pinus sylvestris and Juniperus communis.

Plant Stress 21:101355 (2026)
Publ. Version/Full Text Research data DOI
Open Access Gold
Creative Commons Lizenzvertrag
Gross primary productivity (GPP) drives the land carbon sink, but its response to climate change and extreme weather events like drought remains uncertain. However, GPP cannot be measured directly but must be inferred through proxies, which introduces uncertainties that limit predictions. One promising approach is to measure carbonyl sulfide (COS) fluxes, supported by a thorough understanding of the relative uptake ratio between COS and CO₂, the leaf relative uptake (LRU). We derived plant-scale COS and CO2 fluxes and calculated the LRU of Pinus sylvestris (pine) and Juniperus communis (juniper), under controlled drought conditions. The LRU remained constant (median daytime value of 1.47) in pine across the whole drought gradient due to opposing physiological processes: adjustment of conductances to COS and changes in the ratio of intercellular-to-ambient CO₂ concentration. In juniper, the LRU also had a constant value (daytime median of 1.41) for soil water content (SWC) above 17 % and increased with decreasing SWC below this threshold, driven by a decline in the stomatal to internal conductance to COS. Under drought stress, both COS and CO2 uptake declined more in pine than in juniper. This study highlights LRU variability among species and water availability levels, providing insights into the underlying ecophysiological processes.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Common Juniper ; Controlled Drought Experiment ; Cos/ocs ; Gross Primary Productivity ; Scots Pine ; Stomatal Conductance; Vapor-pressure Deficits; Soil-water Content; Gas-exchange; Isotope Discrimination; Mesophyll Conductance; Stomatal Conductance; Use Efficiency; Photosynthesis; Responses; Forest
ISSN (print) / ISBN 2667-064X
e-ISSN 2667-064X
Journal Plant Stress
Quellenangaben Volume: 21, Issue: , Pages: , Article Number: 101355 Supplement: ,
Publisher Elsevier
Publishing Place Radarweg 29, 1043 Nx Amsterdam, Netherlands
Reviewing status Peer reviewed
Institute(s) Research Unit Environmental Simulation (EUS)
Grants Research Area "Mountain Regions" of the University of Innsbruck
Austrian Science Fund (FWF)
Austrian National Science Fund (FWF)