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A COMPARISON OF CHROMOSOME NUMBER AND KARYOTYPE IN SOMATIC CHROMOSOMES OF STANGERIACEAE (CYCADALES)

Published online by Cambridge University Press:  24 October 2001

G. KOKUBUGATA ,
K. D. HILL ,
G. W. WILSON ,
K. KONDO  and
L. M. RANDALL
G. KOKUBUGATA
Affiliation:
Tsukuba Botanical Garden, National Science Museum, Tokyo, Amakubo, Tsukuba, Ibaraki 305-0005, Japan
K. D. HILL
Affiliation:
National Herbarium of New South Wales, Royal Botanic Gardens, Sydney, Mrs Macquaries Road, Sydney, NSW 2000, Australia
G. W. WILSON
Affiliation:
Department of Tropical Plant Science, James Cook University, Cairns 4870, Australia
K. KONDO
Affiliation:
Laboratory of Plant Chromosome and Gene Stock, Faculty of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
L. M. RANDALL
Affiliation:
54 Cockatoo Court, Caboolture, QLD 4510, Australia
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Abstract

Somatic chromosomes at mitotic metaphase of two species and two undescribed populations of Bowenia, and Stangeria eriopus, which were classified in Stangeriaceae, Cycadales, were compared using the standard aceto-orcein staining method. All Bowenia taxa showed a chromosome number of 2n = 18, while S. eriopus showed a chromosome number of 2n = 16. The chromosome number of 2n = 18 in B. ‘Kuranda’ is reported for the first time. The present karyotype analysis indicates that B. ‘Kuranda’ and another undescribed taxon, B. ‘Tinaroo’, are cytotaxonomically closer to B. spectabilis than B. serrulata, and that the karyotype of Stangeria is unlikely to have been derived from that of Bowenia by a simple chromosomal change such as centromeric fission and deletion.

Keywords

ChromosomeCycadalescytotaxonomyStangeriaceae
Type
Research Article
Information
Edinburgh Journal of Botany , Volume 58 , Issue 3 , November 2001 , pp. 475 - 481
Copyright
© 2001 Trustees of the Royal Botanic Garden, Edinburgh

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