Bouldering : an alternative strategy to long-vertical climbing in root-climbing hortensias - IRD - Institut de recherche pour le développement Accéder directement au contenu
Article Dans Une Revue Journal of the Royal Society Interface Année : 2014

Bouldering : an alternative strategy to long-vertical climbing in root-climbing hortensias

Résumé

In the Neotropics, the genus Hydrangea of the popular ornamental hortensia family is represented by climbing species that strongly cling to their support sur-face by means of adhesive roots closely positioned along specialized anchoring stems. These root-climbing hortensia species belong to the nearly exclusive American Hydrangea section Cornidia and generally are long lianescent climbers that mostly flower and fructify high in the host tree canopy. The Mexican species Hydrangea seemannii, however, encompasses not only long lianescent climbers of large vertical rock walls and coniferous trees, but also short 'shrub-like' climbers on small rounded boulders. To investigate growth form plasticity in root-climb-ing hortensia species, we tested the hypothesis that support variability (e.g. differences in size and shape) promotes plastic responses observable at the mechanical, structural and anatomical level. Stem bending properties, architec-tural axis categorization, tissue organization and wood density were compared between boulder and long-vertical tree-climbers of H. seemannii. For com-parison, the mechanical patterns of a closely related, strictly long-vertical tree-climbing species were investigated. Hydrangea seemannii has fine-tuned morphological, mechanical and anatomical responses to support variability suggesting the presence of two alternative root-climbing strategies that are opti-mized for their particular environmental conditions. Our results suggest that variation of some stem anatomical traits provides a buffering effect that regulates the mechanical and hydraulic demands of two distinct plant architectures. The adaptive value of observed plastic responses and the importance of considering growth form plasticity in evolutionary and conservation studies are discussed.
Fichier principal
Vignette du fichier
Granados_et al_2014.pdf (1.44 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

ird-01100753 , version 1 (07-01-2015)

Identifiants

Citer

Carolina Granados Mendoza, Sandrine Isnard, Tristan Charles-Dominique, Jan van den Bulcke, Nick P Rowe, et al.. Bouldering : an alternative strategy to long-vertical climbing in root-climbing hortensias. Journal of the Royal Society Interface, 2014, 11 (99), pp.2014.0611. ⟨10.1098/rsif.2014.0611⟩. ⟨ird-01100753⟩
454 Consultations
761 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More