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Ribosomal DNA Distribution in Somatic Chromosomes of Stangeria eriopus (Stangeriaceae, Cycadales) and Molecular-Cytotaxonomic Relationships to Some Other Cycad Genera
Goro Kokubugata, Ken D. Hill and Katsuhiko Kondo
Vol. 54, No. 1 (Jan. - Mar., 2002), pp. 1-5
Stable URL: http://www.jstor.org/stable/3218478
Page Count: 5
You can always find the topics here!Topics: Chromosomes, Ribosomal DNA, Nucleolus organizer region, Fluorescence in situ hybridization, Botanical gardens, Karyotype, Genera, DNA probes, Ploidies, Herbaria
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Somatic chromosomes of Stangeria eriopus (Stangeriaceae, Cycadales) were investigated by fluorescent in situ hybridization (FISH) using an 18S ribosomal DNA (rDNA) probe. Stangeria eriopus showed a chromosome number of 2n = 16 with a karyotype of 12 median-, 2 subterminal-, and 2 terminal-centromeric chromosomes. FISH study of S. eriopus revealed 16 signals made up of rDNA sites located on the terminal regions of the long arms of the 7 median- and 2 subterminal-centromeric chromosomes, on terminal region of the short arm of the 1 median-centromeric chromosome, on the terminal regions of the long and the short arms of 1 median- and 2 terminal-centromeric chromosomes. This result suggests that, not only karyomorphologically but also molecular-cytologically, the genus Stangeria may be more closely related to the genus Ceratozamia than the genus Bowenia or the genus Microcycas previously hypothesized.
Brittonia © 2002 New York Botanical Garden Press