| Abstract Detail
Systematics Section/ASPT Léveillé-Bourret, Étienne [1], Gilmour, Claire N. [1], Starr, Julian R. [1], Naczi, Robert F. C. [2], Spalink, Daniel [3], Sytsma, Kenneth J. [4]. Searching for the sister to sedges (Carex): resolving relationships within the Cariceae-Dulichieae-Scirpeae clade (Cyperaceae). With about 2,000 species, tribe Cariceae (Cyperaceae) is a morphologically distinctive cosmopolitan clade possessing holocentric chromosomes (n=6 to 56), complex biogeographic patterns, and habitat diversity ranging from rainforests to deserts. Such a remarkable combination of characteristics should make Cariceae an ideal model for studying the evolution of biodiversity, but they also obscure its relationships within Cyperaceae, which complicates attempts to identify the contributing factors to Cariceae diversity. Recent molecular studies place Cariceae in a strongly supported clade consisting of tribes Dulichieae, Scirpeae s.s., and the enigmatic monotypic genus Khaosokia, but relationships within this clade are unresolved. Using the plastid genes matK and ndhF and a greatly improved taxonomic sampling covering 16 of 17 genera and 55% of the species outside Cariceae, our analyses firmly position Dulichieae and Khaosokia (79% and 85% BS) as successive sisters to a clade consisting of five major lineages (Calliscirpus, Trichophorum + Oreobolopsis + Cypringlea, Cariceae, Scirpus + Eriophorum, and Amphiscirpus + Phylloscirpus + Zameioscirpus), the first four of which receive good to strong support (>80% BS). Cariceae is sister to the Trichophorum clade, but topological tests cannot exclude either Calliscirpus or a Scirpus clade + Zameioscirpus clade as sister to the tribe. Trichophorum appears to be paraphyletic and Eriophorum is firmly nested within Scirpus. There appears to be a trend in the increase of chromosome numbers in Scirpus and Eriophorum, as well as a trend in the reduction and proliferation of the inflorescence throughout the major Cariceae-Dulichieae-Scirpeae clades.
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Related Links:
Plant Systematics & Evolution lab at the University of Ottawa
1 - University of Ottawa, Biology, 30 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada
2 - The New York Botanical Garden, 2900 Southern Blvd., Bronx, NY, 0458-5126, USA
3 - University Of Wisconsin-Madison, Department Of Botany, 430 Lincoln Drive, Madison, WI, 53706, USA
4 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, USA
Keywords:
Carex
Cariceae
Scirpeae
Dulichieae
Scirpus
Eriophorum
Trichophorum
Phylloscirpus
Amphiscirpus
Zameioscirpus
Cypringlea
Oreobolopsis
Dulichium
Blysmus
Khaosokia
matK
ndhF
Phylogenetics.
Presentation Type: Oral Paper:Papers for Sections
Session: 50
Location: Salon 10/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 2:15 PM
Number: 50004
Abstract ID:221
Candidate for Awards:None |
