RT info:eu-repo/semantics/article
T1 Higher leaf nitrogen content is linked to tighter stomatal regulation of transpiration and more efficient water use across dryland trees
A1 Querejeta Mercader, José Ignacio
A1 Prieto Aguilar, Iván
A1 Armas, Cristina
A1 Casanoves, Fernando
A1 Diémé, Joseph S.
A1 Diouf, Mayecor
A1 Yossi, Harouna
A1 Kaya, Bocary
A1 Pugnaire, Francisco I.
A1 Rusch, Graciela M.
A2 Ecologia
K1 Ecología. Medio ambiente
K1 Arid ecosystems
K1 ci/ca ratio
K1 leafδ13C
K1 eafδ18O
K1 Plant isotopic composition
K1 Plant water-use strategies
K1 Sahel
K1 Stomatal conductance
K1 2417.13 Ecología Vegetal
AB [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
PB Wiley-Blackwell
SN 0028-646X
LK http://hdl.handle.net/10612/15203
UL http://hdl.handle.net/10612/15203
NO 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
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 18-jun-2024