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Coming of leaf age: control of growth by hydraulics and metabolics during leaf ontogeny

Coming of leaf age: control of growth by hydraulics and metabolics during leaf ontogeny

Authors :
Florent Pantin
Thierry Simonneau
Bertrand Muller
Écophysiologie des Plantes sous Stress environnementaux (LEPSE)
Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
Source :
New Phytologist 2 (196), 349-366. (2012), New Phytologist, New Phytologist, Wiley, 2012, 196 (2), pp.349-366. ⟨10.1111/j.1469-8137.2012.04273.x⟩
Publication Year :
2012

Abstract

Contents Summary 349 I. Leaf growth: volume, structures, water and carbon 349 II. Coupling water and carbon limitations through the Lockhart model? 350 III. ABA signalling pathway as a hub to coordinate water and carbon relations 353 IV. Leaf venation: just a two-way pipe network? 354 V. Leaf ontogeny orchestrates the actors involved in the control of leaf growth 355 VI. The growing leaf in a changing world 360 VII. Conclusion 361 Acknowledgements 362 References 362 Summary Leaf growth is the central process facilitating energy capture and plant performance. This is also one of the most sensitive processes to a wide range of abiotic stresses. Because hydraulics and metabolics are two major determinants of expansive growth (volumetric increase) and structural growth (dry matter increase), we review the interaction nodes between water and carbon. We detail the crosstalks between water and carbon transports, including the dual role of stomata and aquaporins in regulating water and carbon fluxes, the coupling between phloem and xylem, the interactions between leaf water relations and photosynthetic capacity, the links between Lockhart's hydromechanical model and carbon metabolism, and the central regulatory role of abscisic acid. Then, we argue that during leaf ontogeny, these interactions change dramatically because of uncoupled modifications between several anatomical and physiological features of the leaf. We conclude that the control of leaf growth switches from a metabolic to a hydromechanical limitation during the course of leaf ontogeny. Finally, we illustrate how taking leaf ontogeny into account provides insights into the mechanisms underlying leaf growth responses to abiotic stresses that affect water and carbon relations, such as elevated CO2, low light, high temperature and drought.

Details

Language :
English
ISSN :
0028646X and 14698137
Database :
OpenAIRE
Journal :
New Phytologist 2 (196), 349-366. (2012), New Phytologist, New Phytologist, Wiley, 2012, 196 (2), pp.349-366. ⟨10.1111/j.1469-8137.2012.04273.x⟩
Accession number :
edsair.doi.dedup.....9c9095b54e15d061b7ddf1c055d14902
Full Text :
https://doi.org/10.1111/j.1469-8137.2012.04273.x⟩