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Abstract Detail

Systematics Section/ASPT

MEEROW , ALAN WILLIAM [1], Noblick, Larry [2], Nakamura, Kyoko [3], Sanchez, Vanessa [4], Salas-Leiva, Dayana E. [5], Francisco-Ortega, Javier [6], Jestrow, Brett [7].

When species trees collide: evolutionary and historical biogeography of the cocosoid palms (Areceaceae: Arecoideae: Cocoseae) inferred from sequences of six WRKY gene family loci.

Arecaceae tribe Cocoseae is arguably the most economically important tribe of palms.  It is mostly represented in the neotropics, with one genus and two genera endemic to South Africa and Madagscar, respectively.  Using primers designed from six single copy WRKY gene family loci isolated from Cocos nucifera, we amplified DNA from 96 samples representing all genera of the palm tribe Cocoseae as well as from outgroup taxa representing tribes Roystoneae and Reinhardtieae.  We compared the parsimony, maximum likelihood, and Bayesian analysis of the supermatrix with three species tree estimation approaches.  All three analyses of the supermatrix produce mostly congruent and well-resolved topologies that differ from the a previous analysis with  WRKY loci of only subtribe Attaleinae that used Elaeis and one Bactris species as outgroup.   Lytocaryum, previously nested in Syagrus, is now resolved by parsimony and likelihood as sister to the former with high support; Bayesian analysis maintains Lytocaryum embedded within Syagrus.  Most strikingly, two small sister clades with an Andean/Eastern Brazilian disjunct are now either the first branches in the American endemic Attaleinae with a consequent more ancient age estimation at their stem nodes.  Subtribe Elaeidinae is resolved as sister to the Bactridinae in all analyses.  The resolution of genera of Bactridineae varies as well, but is best supported as being composed of two sister clades, Bactris and Desmoncus in one, and a second comprising Acrocomia, Astrocaryum and Aiphanes.  Two Bayesian, and one likelihood, species tree estimation approaches are incongruent with the super-matrix in a few critical intergeneric clades, but resolve the same infrageneric relationships.  Both position Cocos as sister to Attalea, albeit with low support.  If this is applied as a constraint on the supermatrix parsimony analysis, it results in trees only 4 steps longer.  A coalescent-based gene tree reconciliation analysis suggests that the supermatrix topology requires the lowest cost in terms of transfers, duplications or losses.  The results of divergence age estimation and biogeoraphic analysis are presented

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Related Links:
Phylogenetic analysis of seven WRKY genes across the palm subtribe Attaleinae (Arecaceae) Identifies Syagrus as sister group of the coconut

2 - Montgomery Botanical Center, 11901 Old Cutler Road, Miami, FL, 33156-4242, USA
3 - U.S. Department of Agriculture, Agricultural Research Service, National Germplasm Repository, 13601 Old Cutler Rd., Miami, FL, 33158, USA
4 - Florida International University, Department of Earth and Environment, 11200 SW 8th Street, ECS 347, Miami, FL, 33199, USA
5 - 8930 SW 68th Court Unit# H-8, Miami, FL, 33156, USA
6 - Florida International University, OE 167 - University Park Campus, Miami, FL, 33199, USA
7 - Fairchild Tropical Botanic Garden, Herbarium, 10901 Old Cutler Road, Coral Gables, FL, 33156 , USA

molecular systematics
species tree.

Presentation Type: Oral Paper:Papers for Sections
Session: 31
Location: Pines South/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 1:45 PM
Number: 31002
Abstract ID:162
Candidate for Awards:None

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