A macro-ecological perspective on crassulacean acid metabolism (CAM) photosynthesis evolution in Afro-Madagascan drylands: Eulophiinae orchids as a case study.

Détails

ID Serval
serval:BIB_9EC1FA0F002E
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A macro-ecological perspective on crassulacean acid metabolism (CAM) photosynthesis evolution in Afro-Madagascan drylands: Eulophiinae orchids as a case study.
Périodique
New Phytologist
Auteur(s)
Bone R.E., Smith J.A., Arrigo N., Buerki S.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
208
Numéro
2
Pages
469-481
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Crassulacean acid metabolism (CAM) photosynthesis is an adaptation to water and atmospheric CO2 deficits that has been linked to diversification in dry-adapted plants. We investigated whether CAM evolution can be associated with the availability of new or alternative niches, using Eulophiinae orchids as a case study. Carbon isotope ratios, geographical and climate data, fossil records and DNA sequences were used to: assess the prevalence of CAM in Eulophiinae orchids; characterize the ecological niche of extant taxa; infer divergence times; and estimate whether CAM is associated with niche shifts. CAM evolved in four terrestrial lineages during the late Miocene/Pliocene, which have uneven diversification patterns. These lineages originated in humid habitats and colonized dry/seasonally dry environments in Africa and Madagascar. Additional key features (variegation, heterophylly) evolved in the most species-rich CAM lineages. Dry habitats were also colonized by a lineage that includes putative mycoheterotrophic taxa. These findings indicate that the switch to CAM is associated with environmental change. With its suite of adaptive traits, this group of orchids represents a unique opportunity to study the adaptations to dry environments, especially in the face of projected global aridification.
Mots-clé
Biodiversity, Biological Evolution, Carbon Isotopes, Carboxylic Acids/metabolism, Ecosystem, Madagascar, Orchidaceae/physiology, Photosynthesis, Phylogeny, Principal Component Analysis, Time Factors
Pubmed
Web of science
Open Access
Oui
Création de la notice
26/08/2015 7:25
Dernière modification de la notice
20/08/2019 15:04
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