Not all sweetness and light: Non-structural carbohydrate storage capacity in tree stems is decoupled from leaf but not from root economics

Zhang Guangqi, Mao Zhun, Maillard Pascale, Brancheriau Loïc, Gérard Bastien, Engel Julien, Fortunel Claire, Heuret Patrick, Maeght Jean-Luc, Martínez-Vilalta Jordi, Stokes A.. 2024. Not all sweetness and light: Non-structural carbohydrate storage capacity in tree stems is decoupled from leaf but not from root economics. Functional Ecology, 38 (3) : 668-678.

https://doi.org/10.1111/1365-2435.14492

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

Prévisualisation

Version publiée - Anglais
Sous licence

.
2024_Zhang_Functional Ecology_V38.pdf
Télécharger (14MB) | Prévisualisation

Url - jeu de données - Entrepôt autre : https://doi.org/10.57745/C5BMMI

Résumé : Non-structural carbohydrates (NSC) are considered as indicators of the balance between tree carbon sources and sinks and reflect functional strategies throughout different biomes. However, little is known about the contribution of NSC to tree economics, and in particular, whether leaf, stem and coarse root traits co-ordinate together into a whole-tree economics spectrum. Twenty-four functional traits (including NSC content) were measured in leaves, stem and coarse root xylem of up to 90 angiosperm tree species in temperate, Mediterranean and tropical climates. By performing principal component analysis and standardized major axis regression, we explored the relationships between NSC and other functional traits, as well as the effects of climate and phylogeny on these relationships. Our results revealed a covariation between leaf and coarse root NSC content and leaf economic traits, whereas stem NSC content was largely decoupled from the leaf economics spectrum that was mostly driven by leaf nitrogen content and leaf mass per area. Coarse root xylem traits were closely correlated with leaf traits, while most stem xylem traits were independent from the leaf economics spectrum but covaried with coarse root traits. Trade-offs among traits in tropical species opposed those from other climates. Evolutionary history affected relationships among certain traits but did not change overall patterns. We conclude that due to leaf habit, an extended growing season and heightened defences, tropical species form distinct conservative resource acquisition strategies. Across all climates, as the stem must provide an efficient transport route between roots and leaves, while maintaining the display of branch and leaf organs, stem xylem design and NSC storage capacity lead to a stem economics spectrum that is largely independent from the leaf spectrum, but is coupled with that of coarse roots due to anatomical continuity.

Mots-clés Agrovoc : spectroscopie infrarouge, feuille, tige, bois, phylogénie, photosynthèse, croissance, technique analytique, racine, anatomie végétale

Mots-clés géographiques Agrovoc : France, Guyane française

Mots-clés libres : Climates, Economics spectrum, Functional traits, Leaf habit, Non-structural carbohydrates, Storage, Trade-offs

Classification Agris : F60 - Physiologie et biochimie végétale
F50 - Anatomie et morphologie des plantes
F40 - Écologie végétale

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Agences de financement hors UE : Agence Nationale de la Recherche, China Scholarship Council

Projets sur financement : (FRA) CEnter of the study of Biodiversity in Amazonia

Auteurs et affiliations