Photosynthetica 2022, 60(2):304-322 | DOI: 10.32615/ps.2022.018

Updating the occurrence of crassulacean acid metabolism (CAM) in the genus Clusia through carbon isotope analysis of species from Colombia

P. PACHON1, K. WINTER2, E. LASSO1, 2
1 Department of Biological Science, Universidad de los Andes, Bogotá, Colombia
2 Smithsonian Tropical Research Institute, Balboa, Ancón, Republic of Panama

Clusia is a widely distributed neotropical genus with 321 currently described species. This remarkable genus is the only one known to contain trees sensu stricto with CAM photosynthesis. To survey the occurrence of CAM in Clusia species from Colombia, we determined the leaf stable carbon isotope composition (δ13C) of 568 specimens from 114 species deposited in 12 Colombian herbaria. In the vast majority of specimens, δ13C values indicated that C3 photosynthesis was the principal contributor to carbon gain. δ13C values typical of strong CAM (less negative than -20‰) were observed in only five species, in four of them for the first time. All samples with CAM-type isotopic signatures were collected below 1,000 m a.s.l., whereas species with predominantly C3 occurred from sea level to 3,500 m a.s.l. Together with information already available in the literature, we conclude that CAM is present in 22% (35/156) of the species of Clusia investigated thus far.

Additional key words: C3 photosynthesis; CAM photosynthesis; carbon isotope discrimination; epiphytes; hemiepiphytes; δ13C.

Received: September 29, 2021; Revised: March 8, 2022; Accepted: March 16, 2022; Prepublished online: April 14, 2022; Published: May 2, 2022  Show citation

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PACHON, P., WINTER, K., & LASSO, E. (2022). Updating the occurrence of crassulacean acid metabolism (CAM) in the genus Clusia through carbon isotope analysis of species from Colombia. Photosynthetica, 60(2), 304-322. doi: 10.32615/ps.2022.018
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