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Abstract Detail



Phylogenomics

Moore, Abigail J [1], Hancock, Lillian P [2], Legg-Jack, Ibikari T [3], Talkington, Augustus B [3], Edwards, Erika J [4].

Diversification and gene flow in Anacampseros (Anacampserotaceae) in the Greater Cape Floristic Region, South Africa.

The Anacampserotaceae are a group of succulent plants that, together with the Portulacaceae, are the closest relatives of the cacti. Although the group also occurs in the New World and Australia, the Anacampserotaceae are most diverse in South Africa, where they have recently radiated into various open, rocky habitats in the Greater Cape Floristic Region. We reconstruct species trees and gene family trees from targeted sequence capture data to examine the factors leading to the diversification of Anacampseros in the GCFR. Morphology is phylogenetically conserved, with each of the six main morphological types seeming to have arisen only once (although at least one is paraphyletic). When multiple species co-occur, they do not appear to be each other’s closest relatives, thus supporting allopatric divergence followed by secondary contact instead of parapatric or sympatric divergence. However, even though Anacampseros is self-compatible and appears to be predominantly selfing, some gene exchange does appear to have occurred in some cases of secondary contact. Many species of Anacampseros are narrow endemics, with only a few known populations, and even the species that are more widespread are often endemic to particular substrates. We also explore the role of substrate switching may have played in the diversification of Anacampseros.


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1 - University of Oklahoma, Department of Microbiology and Plant Biology and Oklahoma Biological Survey, 770 Van Vleet Oval, Room 208, Norman, OK, 73019-6131, USA
2 - Brown University, EEB, 80 Waterman Street, Box G-W, Providence, RI, 02912, USA
3 - University of Oklahoma, Department of Microbiology and Plant Biology and Oklahoma Biological Survey, 770 Van Vleet Oval, Room 208, Norman, OK, 73019-6131, United States
4 - Brown University, Box G-W, 80 Waterman St, Providence, RI, 02912, USA

Keywords:
Portullugo
Portulacineae
succulents
CAM photosynthesis.

Presentation Type: Oral Paper
Session: 33, Phylogenomics II
Location: Fort Worth Ballroom 4/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 9:30 AM
Number: 33007
Abstract ID:353
Candidate for Awards:None


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