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Abstract Detail


The Greatest Opportunists of all: Celebrating 40 years of Job Kuijt’s

Morawetz, Jeffery J. [1], Randle, Christopher P. [2].

Progress and pitfalls: Towards a phylogeny of the tropical broomrapes (Orobanchaceae).

The tropical clade of Orobanchaceae contains approximately 40 genera, typically with fewer than 10 species each, and exhibits variation in floral morphology unmatched elsewhere within the family. Despite the economic importance of this clade, which contains three of four noxious parasitic crop weed genera within the family, it has been under-sampled in previous phylogenies. We tested the monophyly of the tropical clade and its major genera using ITS, rpl16 and trnT-L sequences. The tropical clade was strongly supported as monophyletic in all analyses, and four main clades were recovered. The earliest diverging lineage within the tropical clade is comprised of the shrubby genera Asepalum and Cyclocheilon, previously placed within Cyclocheilaceae. The atypical holoparasitic Alectra alba was shown to belong within the primarily holoparasitic Harveya, and the hemiparasitic Harveya obtusifolia was shown to belong to an otherwise holoparasitic lineage within Harveya. The Asian holoparasitic lineage containing Aeginetia and Christisonia is unresolved relative to the African genera Harveya and Hyobanche in the combined parsimony analysis, but is moderately supported as sister to Hyobanche in the combined likelihood analysis. Both New World Melasma species were included, and these were shown to be more closely related to the Neotropical hemiparasitic Escobedia than the African Melasma lineage. These results support a previous study recognizing Nesogenes within the tropical clade of Orobanchaceae rather than the separate family Nesogenaceae. We have also included several small poorly known genera for the first time, verifying their position within the tropical clade, including discussion of their taxonomic affinities.


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1 - University of Michigan, Herbarium & Dept. Ecology and Evolutionary Biology, 3600 Varisty Drive, Ann Arbor, MI, 48108, USA
2 - Sam Houston State University, Department of Biological Sciences, 1900 Avenue I, Huntsville, TX, 77340, USA

Keywords:
holoparasitic
hemiparasitic
Harveya
Melasma
tropical
Cyclocheilaceae
Orobanchaceae.

Presentation Type: Symposium or Colloquium Presentation
Session: SY11
Location: Cottonwood A/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 3:00 PM
Number: SY11004
Abstract ID:47


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