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Journal Article

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
Brittonia
Vol. 54, No. 1 (Jan. - Mar., 2002), pp. 1-5
Published by: Springer on behalf of the New York Botanical Garden Press
Stable URL: http://www.jstor.org/stable/3218478
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Ribosomal DNA Distribution in Somatic Chromosomes of Stangeria eriopus (Stangeriaceae, Cycadales) and Molecular-Cytotaxonomic Relationships to Some Other Cycad Genera
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Abstract

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.

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