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

Abstract：

: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 δ 13C values less negative than -20.0‰, 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.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Li MH,Liu DK,Zhang GQ,Deng H,Tu XD,Wang Y,Lan SR,Liu ZJ

doi

10.1093/jxb/erz461

subject

Has Abstract

pub_date

2019-11-29 00:00:00

pages

6611-6619

issue

22

eissn

0022-0957

issn

1460-2431

pii

5592895

journal_volume

70

pub_type

杂志文章

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