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Título
Higher leaf nitrogen content is linked to tighter stomatal regulation of transpiration and more efficient water use across dryland trees
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
New Phytologist
Número de la revista
4
Cita Bibliográfica
Querejeta, J. I., Prieto, I., Armas, C., Casanoves, F., Diémé, J. S., Diouf, M., Yossi, H., Kaya, B., Pugnaire, F. I., & Rusch, G. M. (2022). Higher leaf nitrogen content is linked to tighter stomatal regulation of transpiration and more efficient water use across dryland trees. New Phytologist, 235(4), 1351-1364. https://doi.org/10.1111/NPH.18254
Editorial
Wiley-Blackwell
Fecha
2022
ISSN
0028-646X
Resumen
[EN] The least-cost economic theory of photosynthesis shows that water and nitrogen are mutually substitutable resources to achieve a given carbon gain. However, vegetation in the Sahel has to cope with the dual challenge imposed by drought and nutrient-poor soils. We addressed how variation in leaf nitrogen per area (Narea) modulates leaf oxygen and carbon isotopic composition (δ18O, δ13C), as proxies of stomatal conductance and water-use efficiency, across 34 Sahelian woody species. Dryland species exhibited diverging leaf δ18O and δ13C values, indicating large interspecific variation in time-integrated stomatal conductance and water-use efficiency. Structural equation modeling revealed that leaf Narea is a pivotal trait linked to multiple water-use traits. Leaf Narea was positively linked to both δ18O and δ13C, suggesting higher carboxylation capacity and tighter stomatal regulation of transpiration in N-rich species, which allows them to achieve higher water-use efficiency and more conservative water use. These adaptations represent a key physiological advantage of N-rich species, such as legumes, that could contribute to their dominance across many dryland regions. This is the first report of a robust mechanistic link between leaf Narea and δ18O in dryland vegetation that is consistent with core principles of plant physiology
Materia
Palabras clave
Peer review
SI
ID proyecto
- info: eu-repo/grantAgreemen/AEI/Programa Estatal de Generación de Conocimiento y Fortalecimiento Científico y Tecnológico del Sistema de I+D+i/ES/PID2019-107382RB-I00/DIVERSIDAD FUNCIONAL DE ESTRATEGIAS DE USO DE AGUA Y NUTRIENTES POR LAS PLANTAS EN ECOSISTEMAS MEDITERRANEOS Y SECOS
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DOI
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