ISSN:
1615-6110
Keywords:
Angiosperms
;
Asteraceae
;
Robinsonia
;
Adaptive radiation
;
chloroplast DNA
;
ribosomal DNA
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00937437
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