+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Phylogenetic relationships within the tribe Justicieae (Acanthaceae): Evidence from molecular sequences, morphology, and cytology

Phylogenetic relationships within the tribe Justicieae (Acanthaceae): Evidence from molecular sequences, morphology, and cytology

Annals of the Missouri Botanical Garden 87(4): 435-458

We used molecular sequence data from the nuclear ribosomal internal transcribed spacers and from the intron and spacer of the trnL-trnF chloroplast region to study phylogenetic relationships within the large (ca. 2000 species), wide-ranging, and taxonomically difficult tribe Justicieae (Acanthaceae). The partition homogeneity test indicated that the data sets for the two loci were congruent, and separate analyses of the two gave similar results. Analysis of the combined data set provides a highly resolved hypothesis of relationships, much of it strongly supported. Justicieae are strongly supported as monophyletic; within the tribe, five lineages and one paraphyletic grade are related as follows: (Pseuderanthemum lineage (Isoglossinae (Tetramerium lineage (multiple clades of Old World "justicioids" (Diclipterinae + New World "justicioids"))))). Many aspects of this phylogenetic hypothesis are supported by data from morphology and cytology, and some conform to earlier classifications of the group. There are, however, a number of novel aspects. Notably, the large genus Justicia (ca. 700 species) is not monophyletic; the Old World members form a grade and the New World members are monophyletic only if a number of other genera are included. The very strongly supported sister-group relationship between Diclipterinae and the New World "justicioid" lineage is novel, and we cannot identify non-molecular synapomorphies to confirm this relationship. Rhinacanthus, a "justicioid" (Justicia and morphologically similar genera) by all but phylogenetic criteria, is strongly supported as a basal member of Diclipterinae, and cytological evidence confirms this placement. The Pseuderanthemum lineage is only modestly supported as monophyletic and may, in fact, represent a series of basal lineages. These plants are marked by having four staminal elements (four stamens or two stamens plus two staminodes), a plesiomorphic condition for all Acanthaceae. Additional evidence (both taxa and characters) will be necessary to resolve this uncertainty, as well as to determine the phylogenetic status of Old World "justicioids." Our analysis does provide considerable resolution of relationships within monophyletic lineages, and these relationships are discussed in the context of non-molecular evidence and previous classifications.

Accession: 011149164

Download citation: RISBibTeXText

DOI: 10.2307/2666140

Download PDF Full Text: Phylogenetic relationships within the tribe Justicieae (Acanthaceae): Evidence from molecular sequences, morphology, and cytology

Related references

Relationships of justicieae d acanthaceae d based on cytology. Genetica (Dordrecht) 41(3): 437-450, 1970

Relationships of Justicieae (Acanthaceae) based on cytology. Genetica 1 (3) 437-450, 1970

Phylogenetic delimitation of Isoglossinae (Acanthaceae : Justicieae) and relationships among constituent genera. Taxon 55(3): 683-694, 2006

The enigmatic tribe Whitfieldieae (Acanthaceae): delimitation and phylogenetic relationships based on molecular and morphological data. Systematic botany 26(1): 104-119, 2001

Chemotaxonomy of the Acanthaceae- tribe Justicieae. Advances in Plant Sciences 11(1): 11-18, June, 1998

Phylogenetic relationships among Acanthaceae: evidence from noncoding trnL-trnF chloroplast DNA sequences. American Journal of Botany 86(1): 70-80, 1999

Phylogenetic relationships among Strobilanthes s.l. (Acanthaceae): evidence from ITS nrDNA, trnL-F cpDNA, and morphology. American Journal of Botany 91(5): 724-735, 2004

Taxonomy of the tribe Justicieae (Acanthaceae) based on wood microscopy. 1968

Study of floral anatomy of the tribe Justicieae (Acanthaceae) with an aim of taxonomical interpretations. Acta Biologica Academiae Scientiarum Hungaricae 20(3): 311-317, 1969

Pollen morphology of Brachystephanus (Acanthaceae-Justicieae). Grana 35(2): 65-73, 1996

Relationships of Justicieae (Acanthaceae) based on wood microscopy. Castanea. 36: 1, 54-61, 1971

A new myco-heterotrophic genus, Yunorchis, and the molecular phylogenetic relationships of the tribe Calypsoeae (Epidendroideae, Orchidaceae) inferred from plastid and nuclear DNA sequences. Plos One 10(4): E0123382-E0123382, 2016