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Abstract Detail


Majure, Lucas Charles [1], Baker, Marc [2], Cloud-Hughes, Michelle [3], Salywon, Andrew [4], Neubig, Kurt M. [5].

Phylogenomics in Cactaceae: A case study using the chollas (Cylindropuntieae, Opuntioideae, Cactaceae) reveals a common pattern out of the Chihuahuan Desert.

The New World clade Cactaceae (ca. 1400-1800 spp.) is an iconic group of mostly stem succulents that occur broadly throughout edaphically arid regions of the Americas. Most phylogenetic reconstructions of the group have been carried out using a handful of plastid and/or nuclear loci. However, no such phylogenetic analysis has incorporated whole genomic data for any specific subclade within the family. Here we present a phylogenomic analysis of tribe Cylindropuntieae, the chollas and relatives, based on plastomes from 42 diploid taxa, which were acquired via paired-end read sequencing on the Illumina HiSeq X Ten platform. Our resulting topology resolves relationships at all levels, generally with high support. We resolve five major clades in Cylindropuntia, while Grusonia s.l. also forms a well-supported clade, excluding Micropuntia pulchella, as has been found in previous studies. Biogeographic analyses suggest that the Cylindropuntia + Grusonia clade appears to have evolved out of the Chihuahuan Desert from where it migrated north into the Sonoran, Mojave and Great Basin deserts, and south into Baja California. There is a repeated pattern with sister species showing divergence (i.e., speciation) via migration from one desert into another (e.g., from the Chihuahuan into the Sonoran Desert). Key morphological features (e.g., spiny fruit) often associated with particular series or groups of species that have been recognized traditionally, and thus which are taxonomically important, actually are widely homoplasious in specific instances. Our data demonstrate the resolving power of using whole plastomes for phylogeny reconstruction in Cactaceae but also that great care must be taken when building these datasets across major groups of cacti, as plastomes in the family are less structurally stable than in most angiosperm families.

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1 - Desert Botanical Garden, Research, Conservation, and Collections, 1201 N. Galvin Parkway, Phoenix, AZ, 85008, USA
2 - Arizona State University, School of Life Sciences, P.O. Box 874501, Tempe, AZ, 85287, USA
3 - Desert Solitaire Botany and Ecological Restoration, San Diego, CA, 92103, USA
4 - Desert Botanical Garden, USDA-ARS, U.S. Arid-Lands Research Center, 1201 N Galvin Parkway, Phoenix, AZ, 85008-3490, USA
5 - Southern Illinois University, Plant Biology, 1125 Lincoln Dr., LSII, room 420, MC6509,, Carbondale, IL, 62901, USA

Chihuahuan Desert
morphological evolution.

Presentation Type: Oral Paper
Session: 29, Phylogenomics I
Location: Fort Worth Ballroom 4/Omni Hotel
Date: Tuesday, June 27th, 2017
Time: 2:45 PM
Number: 29006
Abstract ID:233
Candidate for Awards:None

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