Concerted anatomical change associated with crassulacean acid metabolism in the Bromeliaceae
Jamie Males
+ Author Affiliations
- Author Affiliations
Department of Plant Sciences, University of Cambridge, Cambridge, UK. Email: jamie_males@hotmail.com
Functional Plant Biology 45(7) 681-695 https://doi.org/10.1071/FP17071
Submitted: 14 March 2017 Accepted: 5 January 2018 Published: 8 February 2018
Abstract
Crassulacean acid metabolism (CAM) is a celebrated example of convergent evolution in plant ecophysiology. However, many unanswered questions surround the relationships among CAM, anatomy and morphology during evolutionary transitions in photosynthetic pathway. An excellent group in which to explore these issues is the Bromeliaceae, a diverse monocot family from the Neotropics in which CAM has evolved multiple times. Progress in the resolution of phylogenetic relationships among the bromeliads is opening new and exciting opportunities to investigate how evolutionary changes in leaf structure has tracked, or perhaps preceded, photosynthetic innovation. This paper presents an analysis of variation in leaf anatomical parameters across 163 C3 and CAM bromeliad species, demonstrating a clear divergence in the fundamental aspects of leaf structure in association with the photosynthetic pathway. Most strikingly, the mean volume of chlorenchyma cells of CAM species is 22 times higher than that of C3 species. In two bromeliad subfamilies (Pitcairnioideae and Tillandsioideae), independent transitions from C3 to CAM are associated with increased cell succulence, whereas evolutionary trends in tissue thickness and leaf air space content differ between CAM origins. Overall, leaf anatomy is clearly and strongly coupled with the photosynthetic pathway in the Bromeliaceae, where the independent origins of CAM have involved significant anatomical restructuring.
Additional keywords: functional anatomy, succulence, vascular epiphytes, xerophytism.
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