Ancient allopolyploidy in the everlasting daisies (Asteraceae: Gnaphalieae): Complex relationships among extant clades

Rob D. Smissen, Mercè Galbany-Casals, Ilse Breitwieser

Research output: Contribution to journalArticleResearchpeer-review

41 Citations (Scopus)

Abstract

Phylogenetic analyses have suggested that the everlasting daisy tribe Gnaphalieae colonized the globe repeatedly and rapidly from southern Africa. However, both the circumscription of monophyletic groups of "out of Africa" Gnaphalieae genera and the identification of their sister groups in southern Africa has proved difficult. We have analysed sequences of nrDNA spacers (ITS, ETS), cpDNA (ndhF, trnL intron, trnL-trnF intergenic spacer, trnK intron), and low-copy nuclear markers to examine selected relationships within the crown radiation of the tribe. We focused on relationships among two putative clades suggested by previous studies and a representative sampling of genera endemic to Australasia. Incongruities between nrDNA and cpDNA trees are frequent and some involve robustly supported clades. However, trees generated for two lowcopy nuclear markers are largely congruent with each other but imply that allopolyploidy preceded the radiations of at least four separate extant lineages within the tribe, one largely or entirely restricted to Australasia, one almost global, and two still poorly sampled. Collectively, these four putative allopolyploid lineages may account for more than half of the described species diversity of the tribe.
Original languageEnglish
Pages (from-to)649-662
JournalTaxon
Volume60
Issue number3
Publication statusPublished - 1 Jun 2011

Keywords

  • Hybrid speciation
  • Hybridization
  • Low-copy nuclear genes
  • Paleopolyploidy
  • PgiC
  • Phylogeny

Fingerprint Dive into the research topics of 'Ancient allopolyploidy in the everlasting daisies (Asteraceae: Gnaphalieae): Complex relationships among extant clades'. Together they form a unique fingerprint.

Cite this