Linking stomatal size and density to water use efficiency and leaf carbon isotope ratio in juvenile and mature trees

Petrík, P., Petek-Petrík, A., Lamarque, L. J., Link, R. M., Waite, P.-A., Ruehr, N. K., Schuldt, B. et Maire, V. (2024). Linking stomatal size and density to water use efficiency and leaf carbon isotope ratio in juvenile and mature trees. Physiologia Plantarum, 176 (6). Article e14619. ISSN 0031-9317 DOI 10.1111/ppl.14619

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Résumé

Water-use efficiency (WUE) is affected by multiple leaf traits, including stomatal morphology. However, the impact of stomatal morphology on WUE across different ontogenetic stages of tree species is not well-documented. Here, we investigated the relationship between stomatal morphology, intrinsic water-use efficiency (iWUE) and leaf carbon isotope ratio (δ13C). We sampled 190 individuals, including juvenile and mature trees belonging to 18 temperate broadleaved tree species and 9 genera. We measured guard cell length (GCL), stomatal density (SD), specific leaf area (SLA), iWUE and bulk leaf δ13C as a proxy for long-term WUE. Leaf δ13C correlated positively with iWUE across species in both juvenile and mature trees, while GCL showed a negative and SD a positive effect on iWUE and leaf δ13C. Within species, however, only GCL was significantly associated with iWUE and leaf δ13C. SLA had a minor negative influence on iWUE and leaf δ13C, but this effect was inconsistent between juvenile and mature trees. We conclude that GCL and SD can be considered functional morphological traits related to the iWUE and leaf δ13C of trees, highlighting their potential for rapid phenotyping approaches in ecological studies.

Type de document:	Article
Date de dépôt:	22 mai 2025 12:50
Dernière modification:	22 mai 2025 12:50
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/11960

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