文献类型：期刊文献

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

作者：Li, Ming-He[1,2] Liu, Ding-Kun[1,2] Zhang, Guo-Qiang[3] Deng, Hua[4] Tu, Xiong-De[1,2] Wang, Yan[4] Lan, Si-Ren[1,2] Liu, Zhong-Jian[1,2]

第一作者：Li, Ming-He

通信作者：Lan, SR[1];Liu, ZJ[1];Lan, SR[2];Liu, ZJ[2]

机构：[1]Fujian Agr & Forestry Univ, Key Lab Natl Forestry & Grassland Adm Orchid Cons, Coll Landscape Architecture, Fuzhou 350002, Peoples R China;[2]Fujian Agr & Forestry Univ, Fujian Coll & Univ Engn Res Inst Conservat & Util, Fuzhou 350002, Peoples R China;[3]Orchid Conservat & Res Ctr Shenzhen, Shenzhen Key Lab Orchid Conservat & Utilizat, Shenzhen 518114, Peoples R China;[4]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat,State Forestry A, Beijing 100091, Peoples R China

年份：2019

卷号：70

期号：22

起止页码：6611-6619

外文期刊名：JOURNAL OF EXPERIMENTAL BOTANY

收录：;Scopus(收录号：2-s2.0-85075813954);WOS:【SCI-EXPANDED(收录号:WOS:000506809000011)】；

基金：This work was financially supported through grants from the Scientific Research Foundation of Graduate School of Fujian Agriculture and Forestry University (Grant No. 1122yb006); the Teamwork Projects Funded by Guangdong Natural Science Foundation, China (no. 2017A030312004); the National Key Research and Development Program of China (no. 2018YFD1000401) and the Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization Construction (nos 115/118990050;115/KJG18016A).

语种：英文

外文关键词：Asia; Australia; CAM evolution; CAM plant; constitutive CAM; crassulacean acid metabolism; facultative CAM; molecular dating; Orchidaceae

摘要：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.