Phylogenetic Relationships within the Tribe Justicieae (Acanthaceae): Evidence from Molecular Sequences, Morphology, and Cytology
By L. McDade, T. Daniel, Susan E Masta, K. Riley. 2000
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We uscil molecular sequence data from the tuiclear ribosonial inlernal Iranscribed spacers and from the inlron and spacer of the (niL'trnV chloroplast region to study phylogenelic relationships within the large (ca. 2(KKJ species), wide-ranging, and taxonomically difficult tribe Justici(\ie (Acanthaceae). The partition homogeneity test indicated tlial the data sets for the two loci were congnient, and sejiarate analyses of the two gave similar results. Analysis of the combined data set [)rovitles a highly resolved hypothesis of relationships, much of it strongly sup[)()rted. Justicieae are strongly supported as monopliyletic; within the tribe, five lineages and one parajjli)letic grade are related as follows: \Pseuder-anthemum lineage (Isoglossinae [Teiramcrium lineage [multijih* clades of Old World "justicioids" (Dichpterinae + New World "justicioids")]})]. Many aspects of this phvlogenetic hypothesis are supported by data from morphology and cytology, and some conform to earlier classifications of the grou[). There are, however, a number of novel aspects. Notably, the large genus Juslicia (ca, 700 species) is not monophylctic; the Old World members form a grade and the New World members are monophylctic only if a number of odier genera are included. The very strongly supported sister-group rehitionship between Dichpterinae and the New World "justicioid" lineage is novel, and we cannot identify non-molecular synapornorphies to confirm this relali(niship. Rliindcanllius. a "juslicioid'' {Justuia and mor])hol(>gica]ly similar genera) by all but ph}logenclic criteria, is strongly supported as a basal member of Diclipterinae, and cytological evidence confirms this placement. The Pscuderanlheriiufii lineage is only modestly supported as monophylctic and may, in fact, represent a series of basal bneages. These plants an^ marked by having four staminal elements (four stamens or two stamens plus two staminod**s). a plesiomor[)hic condition for all Acanthaceae. Additional evidence (bolli laxa and characters) will be necessary' to resolve this uncertainty, as well as to determine die phylogenetic status of Old World "justlcioitls." Our analysis does provide considerable resolutujn of relationships within mono|)liyletic lineages, and these relationships are discussed in the context of non-molecular evidcnice and previous classifications.
Subfields: Ecology, Evolution, Behavior and Systematics, Molecular Biology, Plant Science
View Paper: https://www.semanticscholar.org/paper/9bbf94c8557ad72c612ceec53ba2420bc0703a6b
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Citations in the corpus
- Evolutionary Relationships Within the Species-Rich Genus Ruellia (Acanthaceae) (2007, methodology): “Based on prior analyses (EAT unpub. data) that included members of Justicieae, the sister group to Ruellieae (Scotland et al. 1995; McDade and Moody 1999; McDade et al. 2000; Manktelow et al. 2001), Pararuellia flagelliformis was designated as the outgroup in all analyses.”
- A Preliminary Phylogeny of Alloplectus (Gesneriaceae): Implications for the Evolution of Flower Resupination (2003, background): “Other groups that are phylogenetically defined by flower resupination are the Diclipterinae in Acanthaceae (McDade et al. 2000), the subgenus Stenochlamys in Musaceae (Andersson 1985), and the family Lobeliaceae (Lammers 1992).”