Leaf water δ18O reflects water vapour exchange and uptake by C3 and CAM epiphytic bromeliads in Panama.
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Authors
Mejia-Chang, Monica
Reyes-Garcia, Casandra
Seibt, Ulli
Royles, Jessica
Meyer, Moritz T
Jones, Glyn D
Winter, Klaus
Arnedo, Miquel
Publication Date
2021-06Journal Title
Functional Plant Biology: an international journal of plant function
ISSN
1445-4408
Publisher
CSIRO Publishing
Volume
48
Issue
7
Pages
732-742
Type
Article
This Version
VoR
Physical Medium
Print
Metadata
Show full item recordCitation
Mejia-Chang, M., Reyes-Garcia, C., Seibt, U., Royles, J., Meyer, M. T., Jones, G. D., Winter, K., et al. (2021). Leaf water δ18O reflects water vapour exchange and uptake by C3 and CAM epiphytic bromeliads in Panama.. Functional Plant Biology: an international journal of plant function, 48 (7), 732-742. https://doi.org/10.1071/FP21087
Abstract
The distributions of CAM and C3 epiphytic bromeliads across an altitudinal gradient in western Panama were identified from carbon isotope (δ13C) signals, and epiphyte water balance was investigated via oxygen isotopes (δ18O) across wet and dry seasons. There were significant seasonal differences in leaf water (δ18Olw), precipitation, stored 'tank' water and water vapour. Values of δ18Olw were evaporatively enriched at low altitude in the dry season for the C3 epiphytes, associated with low relative humidity (RH) during the day. Crassulacean acid metabolism (CAM) δ18Olw values were relatively depleted, consistent with water vapour uptake during gas exchange under high RH at night. At high altitude, cloudforest locations, C3 δ18Olw also reflected water vapour uptake by day. A mesocosm experiment with Tillandsia fasciculata (CAM) and Werauhia sanguinolenta (C3) was combined with simulations using a non-steady-state oxygen isotope leaf water model. For both C3 and CAM bromeliads, δ18Olw became progressively depleted under saturating water vapour by day and night, although evaporative enrichment was restored in the C3 W. sanguinolenta under low humidity by day. Source water in the overlapping leaf base 'tank' was also modified by evaporative δ18O exchanges. The results demonstrate how stable isotopes in leaf water provide insights for atmospheric water vapour exchanges for both C3 and CAM systems.
Keywords
Oxygen Isotopes, Panama, Plant Leaves, Steam, Water
Sponsorship
Natural Environment Research Council (NE/M001946/1)
Identifiers
External DOI: https://doi.org/10.1071/FP21087
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334748
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/
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