Abstract Detail

Systematics Section/ASPT

Randle, Christopher [1], Morawetz, Jeffery [2], Bayat, Soheila [1], Hammack, David [3], Shrum, Skylar  [1], Singh, Nata [4], Ilunga, Edouard [5], Souza, Vinicius [6].

Phylogenetic investigation of diversity in the tropical clade of Orobanchaceae.

Most of the known species diversity in the parasitic plant family Orobanchaceae occurs in temperate regions. However, diversity in the well supported clade of tropical Orobanchaceae remains largely unexplored.  With the exception of Buchnera (with 100 species), most genera of the tropical clade consist of few poorly characterized and rarely collected species. Although tribe-level classification systems include such poorly known genera, few thorough phylogenetic analyses exist to test these interpretations. In this study, we have expanded phylogenetic sampling of tropical species and genera in over previous studies through field collection of species from the paleotropics and neotropics.  For the first time, the genera Buttonia, Cycniopis, Ghikea, Gerardiina, Micrargeriella and Pseudosopubia are included in systematic analysis of the tropical clade.  Further, species sampling of genera Buchnera, Cycnium, Melasma, Sopubia, and Striga, has been greatly expanded. DNA sequences of the following loci were obtained from circa 150 ingroup and outgroup accessions of more than 100 species: the nuclear Internal Transcribed Spacer (ITS), and chloroplast loci matk, rbcL, rpl16, and rps2.  Phylogenetic analysis was used to explore 1) monophyly and relationships among major genera, 2) proposed tribe-level taxonomies, and 3) evolution of holoparasitism and hemiparasitism in this clade.

1 - Sam Houston State University, Biological Sciences, 1900 Avenue I, Huntsville, TX, 77340, USA
2 - Rancho Santa Ana Botanic Garden, 1500 N. College Ave., Claremont, CA, 91711, US
3 - Sam Houston State University, Biological Sciences, 1900 Avenue I, Huntsville, TX, 77340, US
4 - Rancho Santa Ana Botanic Garden , 1500 N. College Ave, Claremont, CA, 91711, USA
5 - Université de Lubumbashi, Sciences Agronomiques, Lubumbashi, Katanga, DRC
6 - , Universidade de São Paulo, Escola Superior de Agricultura Luiz de Qu, Ciências Biológicas, Avenida Pádua Dias, 11-Caixa Postal Agronomia, Piracicaba, SP, 13418-900 , Brazil

Keywords:
Orobanchaceae
tropical
systematics
parasitic plants.

Presentation Type: Oral Paper:Papers for Sections
Session: 45
Location: River Fork/Grove
Date: Wednesday, July 30th, 2014
Time: 2:30 PM
Number: 45005
Abstract ID:104
Candidate for Awards:None