Allozyme diversity ofPittosporum (Pittosporaceae) on the Bonin (Ogasawara) Islands
- 79 Downloads
The genusPittosporum includes about 160 species. Four species ofPittosporum occur in the Bonin Islands, and all of these are endemic to the islands. Electrophoretic studies of the four endemic species,P. tobira, from the Japanese mainland, andP. lutchuense var.denudatum from the Ryukyu Islands, were used to determine the origin and speciation pattern of the endemic species.
259 individuals were sampled from ten populations. Twenty loci in nine enzyme systems were resolved and used to calculate the gene frequencies for each population. A low genetic diversity was observed in three of the Bonin Island species, as is reported for other oceanic island plants. The exception,P. boninense, has the largest population size and widest distribution. A dendrogram generated by the UPGMA method shows two clusters. One consists of only the Bonin endemics, suggesting a monophyletic origin for these species.
Key wordsAdaptive radiation Bonin islands Oceanic islands Pittosporum
Unable to display preview. Download preview PDF.
- Cardy, B.J., Sturber, C.W. andGoodman, M.N. 1981. Techniques for starch gel electrophoresis of enzyme from maize (Zea mays), revised. Institution of Statistics Mimeoprahy Series No. 1317. North Carolina State University, Raleigh.Google Scholar
- Crawford, D.J. 1983. Phylogenetic and systematic inferences from electrophoretic studies.In S.D. Tanksley and T.J. Orton, eds., Isozymes in Plant Genetics and Breeding, Part A. Elsever, New York, pp. 257–287.Google Scholar
- Crawford, D.J. 1997. Plant speciation on oceanic islands.In K. Iwatsuki and P.H. Raven, eds., Evolution and Diversification of Land Plants, J. Pl. Res. Special Issue No. 4, Springer-Verlag, Tokyo, pp. 249–267.Google Scholar
- Felsenstein, J. 1993. PHYLIP; Phylogeny Inference Package version 3.5c. Distributed by the author, Department of Genetics, University of Washington, Seattle.Google Scholar
- Fujii, N., Ueda, K., Watano, Y. andShimizu T. 1997. Intraspecific sequence variation of chloroplast DNA inPedicularis chamissonis Steven (Scrophulariaceae) and geographic structuring of the Japanese “alpine” plants. J. Plant. Res.110: 195–208.Google Scholar
- Hamrickm J.L. andGodt, M.J.W. 1989. Allozyme diversity in plant species.In A.D.H. Brown, M.T. Clegg, A.L. Kahler, and B.S. Weir, eds., Plant Population Genetics, Breeding and Genetic Resources. Sinauer, Sunderland, pp. 43–63.Google Scholar
- Ito, M., Soejima, A. andOno, M. 1997. Genetic diversity of the endemic plants of Bonin (Ogasawara) Islands.In T.F. Stuessy and M. Ono, eds., Evolution and Speciation of Island Plants. Columbia Univ. Press, Cambridge, in press.Google Scholar
- Kang, S.S. andChung, M.G. 1997. Genetic variation and population structure in Korean endemic species: IV.Hemerocallis hakuunensis (Liliaceae). J. Plant Res.110: 209–218.Google Scholar
- Kobayashi, S. 1982. A taxonomical note onPittosporum tobira and its allied species. Jour. Jap. Bot.57: 70–80.Google Scholar
- Nakazawa, M., Wakabayashi, M., Ono, M. andMurata, J. 1997. Molecular phylogenetic analysis ofChrysosplenium (Saxifragaceae) in Japan. J. Plant Res.110: 265–274.Google Scholar
- Ohba, H. 1989. Pittosporaceae.In Y. Satakeet al., eds, Wild Flowers of Japan. Woody Plants I., Heibon-sha, Tokyo, pp. 177–178.Google Scholar
- Ono, M. 1991. The flora of the Bonin (Ogasawara) Islands: endemism and dispersal modes. Aliso13: 95–105.Google Scholar
- Sneath, P.H. andSokal, R.R. 1973. Numerical Taxonomy. W.H. Freeman and company, San Francisco.Google Scholar
- Soltis, D.E. andSoltis, P.S. 1989. Isozyme in Plant Biology. Dioscorides Press, Portland, Oregon.Google Scholar
- Soltis, P.S., Soltis, D.E. andDoyle, J.J. 1992. Molecular Systematics of Plants. Chapman and Hall, New York.Google Scholar