4.7 Article

A perspective on crassulacean acid metabolism photosynthesis evolution of orchids on different continents: Dendrobium as a case study

期刊

JOURNAL OF EXPERIMENTAL BOTANY
卷 70, 期 22, 页码 6611-6619

出版社

OXFORD UNIV PRESS
DOI: 10.1093/jxb/erz461

关键词

Asia; Australia; CAM evolution; CAM plant; constitutive CAM; crassulacean acid metabolism; facultative CAM; molecular dating; Orchidaceae

资金

  1. Scientific Research Foundation of Graduate School of Fujian Agriculture and Forestry University [1122yb006]
  2. Guangdong Natural Science Foundation, China [2017A030312004]
  3. National Key Research and Development Program of China [2018YFD1000401]
  4. Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization Construction [115/118990050, 115/KJG18016A]

向作者/读者索取更多资源

Members of the Orchidaceae, one of the largest families of flowering plants, evolved the crassulacean acid metabolism (CAM) photosynthesis strategy. It is thought that CAM triggers adaptive radiation into new niche spaces, yet very little is known about its origin and diversification on different continents. Here, we assess the prevalence of CAM in Dendrobium, which is one of the largest genera of flowering plants and found in a wide range of environments, from the high altitudes of the Himalayas to relatively arid habitats in Australia. Based on phylogenetic time trees, we estimated that CAM, as determined by delta C-13 values less negative than -20.0 parts per thousand, evolved independently at least eight times in Dendrobium. The oldest lineage appeared in the Asian clade during the middle Miocene, indicating the origin of CAM was associated with a pronounced climatic cooling that followed a period of aridity. Divergence of the four CAM lineages in the Asian clade appeared to be earlier than divergence of those in the Australasian clade. However, CAM species in the Asian clade are much less diverse (25.6%) than those in the Australasian clade (57.9%). These findings shed new light on CAM evolutionary history and the aridity levels of the paleoclimate on different continents.

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