Plant Systematics and Evolution

, Volume 184, Issue 3–4, pp 233–239 | Cite as

Ribosomal and chloroplast DNA restriction site mutations and the radiation ofRobinsonia (Asteraceae: Senecioneae) on the Juan Fernandez Islands

  • Daniel J. Crawford
  • Tod F. Stuessy
  • Mary Beth Cosner
  • David W. Haines
  • Mario O. Silva
Article

Abstract

Restriction site mutations in the chloroplast (cpDNA) and ribosomal DNA (rDNA) were examined in 41 populations representing five of the seven recognized species of the genusRobinsonia, which is endemic to the Juan Fernandez Islands. No intraspecific variation was detected for cpDNA but one population of one of the species (R. evenia) had a restriction site mutation in rDNA not detected elsewhere. No restriction site mutations were unique to all species ofRobinsonia relative to the species ofSenecio used as outgroups. All 13 mutations (eight from cpDNA and five from rDNA) are restricted to single species, and thus provide no cladistically useful information within the genus. The distribution of mutations is concordant with the hypothesis of a rapid adaptive radiation ofRobinsonia subsequent to the dispersal of its ancestor to Masatierra.

Key words

Angiosperms Asteraceae Robinsonia Adaptive radiation chloroplast DNA ribosomal DNA 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Daniel J. Crawford
    • 1
  • Tod F. Stuessy
    • 1
  • Mary Beth Cosner
    • 1
  • David W. Haines
    • 1
  • Mario O. Silva
    • 2
  1. 1.Department of Plant BiologyThe Ohio State UniversityColumbusUSA
  2. 2.Departamento de BotanicaUniversidad de ConcepciónChile

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