Contemporaneous And Recent Radiations Of The World's Major Succulent Plant Lineages

Title:
Contemporaneous And Recent Radiations Of The World's Major Succulent Plant Lineages
Authors:
Arakaki, Monica; Christin, Pascal-Antoine; Nyffeler, Reto; Lendel, Anita; Eggli, Urs; Ogburn, R. Matthew; Spriggs, Elizabeth; Moore, Michael J.; Edwards, Erika J.
Abstract:
The cacti are one of the most celebrated radiations of succulent plants. There has been much speculation about their age, but progress in dating cactus origins has been hindered by the lack of fossil data for cacti or their close relatives. Using a hybrid phylogenomic approach, we estimated that the cactus lineage diverged from its closest relatives approximate to 35 million years ago (Ma). However, major diversification events in cacti were more recent, with most species-rich clades originating in the late Miocene, approximate to 10-5 Ma. Diversification rates of several cactus lineages rival other estimates of extremely rapid speciation in plants. Major cactus radiations were contemporaneous with those of South African ice plants and North American agaves, revealing a simultaneous diversification of several of the world's major succulent plant lineages across multiple continents. This short geological time period also harbored the majority of origins of C(4) photosynthesis and the global rise of C(4) grasslands. A global expansion of arid environments during this time could have provided new ecological opportunity for both succulent and C(4) plant syndromes. Alternatively, recent work has identified a substantial decline in atmospheric CO(2) approximate to 15-8 Ma, which would have strongly favored C(4) evolution and expansion of C(4)-dominated grasslands. Lowered atmospheric CO(2) would also substantially exacerbate plant water stress in marginally arid environments, providing preadapted succulent plants with a sharp advantage in a broader set of ecological conditions and promoting their rapid diversification across the landscape.
Citation:
Arakaki, Monica, Pascal-Antoine Christin, Reto Nyffeler, Anita Lendel, et al. 2011. "Contemporaneous And Recent Radiations Of The World's Major Succulent Plant Lineages." Proceedings Of The National Academy Of Sciences Of The United States Of America 108(20): 8379-8384.
Publisher:
National Academy of Sciences
DATE ISSUED:
2011-05
Department:
Biology
Type:
article
PUBLISHED VERSION:
10.1073/pnas.1100628108
PERMANENT LINK:
http://hdl.handle.net/11282/310075

Full metadata record

DC FieldValue Language
dc.contributor.authorArakaki, Monicaen_US
dc.contributor.authorChristin, Pascal-Antoineen_US
dc.contributor.authorNyffeler, Retoen_US
dc.contributor.authorLendel, Anitaen_US
dc.contributor.authorEggli, Ursen_US
dc.contributor.authorOgburn, R. Matthewen_US
dc.contributor.authorSpriggs, Elizabethen_US
dc.contributor.authorMoore, Michael J.en_US
dc.contributor.authorEdwards, Erika J.en_US
dc.date.accessioned2013-12-23T16:24:43Zen
dc.date.available2013-12-23T16:24:43Zen
dc.date.issued2011-05en
dc.identifier.citationArakaki, Monica, Pascal-Antoine Christin, Reto Nyffeler, Anita Lendel, et al. 2011. "Contemporaneous And Recent Radiations Of The World's Major Succulent Plant Lineages." Proceedings Of The National Academy Of Sciences Of The United States Of America 108(20): 8379-8384.en_US
dc.identifier.issn0027-8424en_US
dc.identifier.urihttp://hdl.handle.net/11282/310075en
dc.description.abstractThe cacti are one of the most celebrated radiations of succulent plants. There has been much speculation about their age, but progress in dating cactus origins has been hindered by the lack of fossil data for cacti or their close relatives. Using a hybrid phylogenomic approach, we estimated that the cactus lineage diverged from its closest relatives approximate to 35 million years ago (Ma). However, major diversification events in cacti were more recent, with most species-rich clades originating in the late Miocene, approximate to 10-5 Ma. Diversification rates of several cactus lineages rival other estimates of extremely rapid speciation in plants. Major cactus radiations were contemporaneous with those of South African ice plants and North American agaves, revealing a simultaneous diversification of several of the world's major succulent plant lineages across multiple continents. This short geological time period also harbored the majority of origins of C(4) photosynthesis and the global rise of C(4) grasslands. A global expansion of arid environments during this time could have provided new ecological opportunity for both succulent and C(4) plant syndromes. Alternatively, recent work has identified a substantial decline in atmospheric CO(2) approximate to 15-8 Ma, which would have strongly favored C(4) evolution and expansion of C(4)-dominated grasslands. Lowered atmospheric CO(2) would also substantially exacerbate plant water stress in marginally arid environments, providing preadapted succulent plants with a sharp advantage in a broader set of ecological conditions and promoting their rapid diversification across the landscape.en_US
dc.publisherNational Academy of Sciencesen_US
dc.identifier.doi10.1073/pnas.1100628108en
dc.subject.departmentBiologyen_US
dc.titleContemporaneous And Recent Radiations Of The World's Major Succulent Plant Lineagesen_US
dc.typearticleen_US
dc.identifier.journalProceedings Of The National Academy Of Sciences Of The United States Of Americaen_US
dc.subject.keywordClimate changeen_US
dc.subject.keywordPaleobotanyen_US
dc.subject.keywordCAM photosynthesisen_US
dc.identifier.volume108en_US
dc.identifier.issue20en_US
dc.identifier.startpage8379en_US
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