Publications des scientifiques de l'IRD

Salmon C., Isnard Sandrine, Caraglio Y., Heuret P. (2023). Architectural traits underlie growth form diversity and polycarpic versus monocarpic life histories in Cerberiopsis (Apocynaceae). Botanical Journal of the Linnean Society, [Early access], 510-528. ISSN 0024-4074.

Titre du document
Architectural traits underlie growth form diversity and polycarpic versus monocarpic life histories in Cerberiopsis (Apocynaceae)
Année de publication
2023
Type de document
Article référencé dans le Web of Science WOS:001008890500001
Auteurs
Salmon C., Isnard Sandrine, Caraglio Y., Heuret P.
Source
Botanical Journal of the Linnean Society, 2023, [Early access], 510-528 ISSN 0024-4074
Plant architecture strongly influences plant growth habits, as it determines the arrangement, function and fate of meristems. How architecture could be involved in the monocarpic life history, i.e. dying after flowering, remains poorly investigated. Monocarpy is evident in some species since they are annual or because their single stem flowers apically. However, monocarpy in long-lived branched trees is rare and remains poorly understood. We aim to highlight the architectural features involved in the monocarpic strategy of Cerberiopsis candelabra, a rainforest tree endemic to New Caledonia. We conducted a comparative analysis of the genus, which comprises three species with different growth habits. Twenty plants of each species were studied at different ontogenic stages. We compared their developmental sequence and analysed their processes of growth, branching, flowering and reiteration. We identified a combination of traits that distinguish the species, and we found a syndrome of two architectural features that support the monocarpic strategy in C. candelabra: the synchronous flowering of all terminal meristems and the absence of delayed branching. Flowering in C. candelabra preferentially occurs when the complete architectural sequence is developed, but the plant never shows signs of senescence, suggesting that environmental stresses, such as wind disturbance, could be the main trigger for flowering. The architecture of C. candelabra is suggested to be the most derived in the genus.
Plan de classement
Sciences du monde végétal [076]
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD
Identifiant IRD
PAR00026229
Contact