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Abstract

This paper presents phylogenies of the small
but ecologically and horticulturally important Australian
genus Correa (Rutaceae). Consensus phylogenies generated
using parsimony were congruent with their counterparts
generated by Bayesian analysis, although usually less
well resolved. The phylogeny generated from the second
internal transcribed spacer region of the nuclear ribosomal
DNA supported the monophyly of Correa and identified
two well supported clades (one comprising C. lawrenceana
and C. baeuerlenii and the other containing all other species
of the genus). Phylogenetic reconstructions based on
the combined trnL-trnF spacer and the trnK intron
(including the matK gene) regions of chloroplast DNA also
supported the monophyly of Correa and of the C. lawrenceana/
C. baeuerlenii clade, but the topology among the
other species differed markedly from that in the ITS-based
phylogeny. The major clades identified in the chloroplast
phylogenies seemed to follow geographic patterns rather
than species boundaries, with different samples of
C. glabra bearing chloroplast genotypes from different
clades. These patterns are likely to be because of independent
evolution of the chloroplast and nuclear genomes,
and are typical of cases of introgressive hybridisation
among species or incomplete lineage sorting of chloroplast
genomes leading to incongruence between chloroplast and
nuclear phylogenies. Thus, the phylogenies based on
nuclear DNA should reflect species relations better than the
chloroplast phylogeny in Correa, and we propose a new
subgeneric classification of the genus on the basis of the
ITS-based phylogeny and morphology. Correa subgenus
Persistens Othman, Duretto and G.J. Jord., containing
C. lawrenceana and C. baeuerlenii, is formally described.

Item Type:	Article
Authors/Creators:	Othman, RNA and Jordan, GJ and Worth, JRP and Steane, DA and Duretto, MF
Keywords:	Correa Taxonomy Phylogeny Rutaceae Chloroplast capture Hybridisation
Journal or Publication Title:	Plant Systematics and Evolution
ISSN:	0378-2697
DOI / ID Number:	https://doi.org/10.1007/s00606-010-0315-0
Additional Information:	The original publication is available at http://www.springerlink.com
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