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Occurrence and evolutionary origins of polyploids in the clubmoss genusDiphasiastrum(Lycopodiaceae)

Authors
Journal
Molecular Phylogenetics and Evolution
1055-7903
Publisher
Elsevier
Publication Date
Volume
52
Issue
3
Identifiers
DOI: 10.1016/j.ympev.2009.05.004
Keywords
  • Diphasiastrum
  • Feulgen Dna Image Densitometry
  • Lycopodium
  • Lycopodiaceae
  • Low-Copy Nuclear Genes
  • Phylogenies
  • Polyploidy

Abstract

Abstract Two polyploid taxa are commonly recognized in the genus Diphasiastrum, D. wightianum from Asia and D. zanclophyllum from South Africa and Madagascar. Here we present results from Feulgen DNA image densitometry analyses providing the first evidence for the polyploid origin of D. zanclophyllum. Also reported for the first time are data confirming that D. multispicatum and D. veitchii, representing the putative parent lineages of D. wightianum, are diploids. Phylogenetic analyses of the nuclear regions RPB2, LEAFY and LAMB4 reveal that putative tetraploid accessions are of allopolyploid origin. Diphasiastrum zanclophyllum shows close relationship to the North American taxon D. digitatum on the maternal side, but the paternal relationship is less clear. Two accessions from Asia, both inferred to be polyploid, have D. veitchii as the maternal parent, whereas the paternal paralogs show relationships to D. multispicatum and D. tristachyum, respectively. None of these parental combinations have previously been hypothesized.

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