Xylem and Phloem in Petioles Are Coordinated With Leaf Gas Exchange in Oaks With Contrasting Anatomical Strategies Depending on Leaf Habit
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Date
2024
Authors
Martín Sánchez, RubénSancho Knapik, Domingo
Ferrio Díaz, Juan Pedro
Alonso Forn, David
Losada, Juan Manuel
Peguero Pina, José Javier
Mencuccini, Maurizio
Gil Pelegrín, Eustaquio
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Abstract
As the single link between leaves and the rest of the plant, petioles must develop conductive tissues according to the water influx and sugar outflow of the leaf lamina. A scaling relationship between leaf area and anatomical traits of xylem and phloem is expected to improve the efficiency of these tissues. However, the different constraints compromising the functionality of both tissues (e.g., risk of cavitation) must not be disregarded. Additionally, deciduous and evergreen plants may have different strategies to produce and package their petiole conduits to cope with environmental restrictions. We explored in 33 oak species the relationships between petiole anatomical traits, leaf area, stomatal conductance, and photosynthesis rate. Results showed allometric scaling between anatomical structure of xylem and phloem with leaf area. We also found correlations between photosynthesis rate, stomatal conductance, and anatomical traits in the petiole. The main novelty is how oaks present a different strategy depending on the leaf habit. Deciduous species tend to increase their diameters to achieve greater leaf-specific conductivity. By contrast, evergreen oaks develop larger xylem conductive areas for a given leaf area than deciduous ones. This trade-off between safety-efficiency in petioles has never been attributed to the leaf habit of the species.
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Bibliographic citation
Martín-Sánchez, R., Sancho-Knapik, D., Ferrio, J. P., Alonso-Forn, D., Losada, J. M., Peguero-Pina, J. J., Mencuccini, M., & Gil-Pelegrín, E. (s. f.). Xylem and Phloem in Petioles Are Coordinated With Leaf Gas Exchange in Oaks With Contrasting Anatomical Strategies Depending on Leaf Habit. Plant, Cell & Environment. https://doi.org/10.1111/pce.15231
AGROVOC subjects
QuercusConductividad hidráulica
Fotosíntesis
Peciolo
Anatomía de la planta
Other field subjects
Anatomía De La PlantaConductividad Hidráulica
Fotosíntesis
Peciolo
Quercus
Sponsorship
This research was supported by Grant PID2022-136478OB-C32 funded by MICIU/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”, by grant CNS2022-136156 funded by MCIN/AEI/10.13039/501100011033 and European Union Next Generation EU/PRTR and by Gobierno de Aragón S74_23R research group.